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# AS Titrations watch

1. Need help with these titration questions.

"A household cleaner contains ammonia (NH3). A 25.37g sample of this is dissolved in water and made up to 250cm^3. A 25cm^3 portion of this requires 37.3cm^3 of 0.36 mol/dm^-3 H2SO4 for neutralisation. What percentage of ammonia is in the cleaner."

AND

"25cm^3 of 0.2mol/dm^-3 nitric acid is neutralised completely by a solution of sodium hydrogen carbonate. The volume of sodium hydrogen carbonate solution that must be used is fixed at 35cm^3.

(a) calculate the concentration the solution must be.
b) what mass of sodium hydrogen carbonate will need to be added to make up 250cm^3 of this solution.

2. In general all titration calculations are about writing reaction equation and following stoichiometry - remembering that amount of substance is n=CV. See if this explanation doesn't help.

These particular questions require also converting number of moles to mass of the substance. It just means multiplying by molar mass.

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Updated: October 8, 2013
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