PH help?

Question

PH help?

amtran_bus · Answer

A 20.481 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 75.990 g of water. A 13.547 g aliquot of this solution is then titrated with 0.1066 M HCl. It required 28.83 mL of the HCl solution to reach the methyl red endpoint. Calculate the weight percent NH3 in the aqueous waste.

amtran_bus · Answer

Sorry! For some reason it deleted the body when I edited the title!

amtran_bus · Answer

@aaronq

aaronq · Answer

So the moles present in the aliquot sampled is equal to the moles of HCl (28.83 mL of 0.1066 M HCl). Scale that up to the total amount taken. Convert it the total moles present (in the waste sample) to mass. Find the percent of mass of it.

I'm guessing we have to assume the solution had the same density as water.