Q. A solution of sodium hydroxide has a concentration of 10 g per cubic decimetre, what is its concentration in moles per cubic decimetre or "molarity"?


H = 1, Na = 23, O = 16


Q. What is the concentration in grams per cubic decimetre of a 1.25 molar solution of sodium carbonate?


Na = 23, C = 12, O = 16


Q. A sample of sulphuric acid is found to have a concentration of 2.45 g per cubic decimetre, what is its concentration in moles per cubic decimetre?


H = 1, S = 32, O = 16


Let's take the last question little bit further. One of the things you will also require to do is to calculate the concentration of a substance (usually acid or base) by titrating it against a known concentration of another substance (the opposing acid or base until the neutralisation / endpoint is reached).


A student is given a sample of the above Sulphuric Acid, and conducts 3 titrations using 25 cm³ of Sulphuric Acid each time, titrating it against a solution of Sodium Hydroxide with an unknown concentration. The average of the 3 titrations is 12.5 cm³. From this information calculate the concentration in moles per litre of the Sodium Hydroxide solution.


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