You may find sometimes that a solution being made has a diluent added. This diluent WILL affect the concentration of the component under consideration and should be dealt with as if it had a zero concentration.
Diluents have a concentration of 0%.
200 ml of 10 % (w/v) Ammonia and 200 ml of 5 % Ammonia are mixed together and the volume is made up to 500 ml with water. What is the concentration of the resulting solution?
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The water is a diluent and therefore has a concentration of 0 % Ammonia.
The volume of water that will be added is 500 - (200 + 200) ml ie 100 ml. The concentration of the final solution is found from the following:
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