The concentration of ammonia in a household solution can be determined by titration .In one titration, 20.0 mL samples of the household ammonia solution were titrated with a standard HCI solution.

(b) A different procedure was then followed, as summarised below:

Step 1 - A volume of 25.0 mL of the household ammonia solution was made up to 250.00 mL.

Step 2 - A 20.00 mL aliquot was taken and immediately added to 50.00 mL of 0.1000 mol L-1 HCI solution. An equation for the reaction that occurred is shown below:NH3 + HCI → NH4CI

Step 3 - Unreacted acid was titrated with sodium hydroxide solution. A volume of 7.70 mL of 0.1302mol L-1sodium hydroxide solution was required. An equation for the reaction that occurred is shown below.HCI + NaOH →NaCl + H20

(i) Calculate the number of moles of HCI that were added to the diluted ammonia solution in Step 2.

(ii) Calculate the number of moles of HCl that reacted with sodium hydroxide in Step 3.

(iii) Calculate the number of moles of HCI that reacted with ammonia in Step 2.

(iv) Calculate the number of moles of ammonia in the 20.00 mL aliquot that was titrated in Step 2.

(v) Hence calculate the number of moles of ammonia in the 250.0 mL of diluted ammonia solution.

(vi) Hence calculate the %w/v of ammonia in the household ammonia solution.