Test kits for water analysis
Test kits for water analysis

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

Test kits for water analysis


An expression of how close a given measurement from a set of results is to the true or accepted value.
The electrode in an electrochemical cell where oxidation takes place.
Set of operations that establish, under specified conditions, the relationship between values indicated by a measuring instrument or measuring system and the corresponding known values of a standard.
The electrode in an electrochemical cell where reduction takes place.
Dissolving the whole of a sample, usually in acid, to destroy organic material.
Dynamic equilibrium
In a reversible chemical reaction the rate of the forward and reverse reactions are equal, so there is no net change in the system and the reaction is said to be at a point of dynamic equilibrium.
Electrical conductivity
Measure of the ability of a substance to conduct electric current.
A component of an electrochemical cell at which oxidation or reduction takes place.
Electrochemical cell
A solution (the electrolyte) into which is immersed two electrodes which are in electrical contact with each other.
The concentration ratio of reactants where an indicator changes colour in a titration.
Equivalence point
In a titration, the point where reactants have reacted together in an exact ratio of quantities determined by the balanced chemical equation for the reaction (i.e. stoichiometrically).
Gravimetric analysis
A chemical analysis in which a desired constituent is converted into a substance (of known composition) that can be separated from the sample and weighed.
Concomitants in a sample that contribute to the analytical response.
Light scattering
Deviation of light from a straight path due to interactions with the medium through which it passes.
Oxidising agent
A substance that gains electrons during a redox chemical reaction
The pH of an aqueous solution is an expression of its acidic or alkaline nature, and is defined as: pH = - log [H+ (aq)]
An expression of how reproducible a given measurement is.
Reducing agent
A substance that loses electrons during a redox chemical reaction
The capacity of an analytical method to remain unaffected by small but deliberate variations in method parameters. This provides an indication of the method's reliability during normal usage.
Falls short of the accuracy of a quantitative measurement (gives an approximation of a particular quantity).
The reaction of a solution of known concentration with a solution of unknown concentration until reaction is complete.
Working range
Concentration range over which the analytical method produces accurate quantitative data.

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371