Calculate Mass Percent: HNO3 in Sample

[Ki-nana18]

Homework Statement

A sample conaining both HCl and HNO3 had a density of 1.083g/ml. A 43.00 ml amount of this sample required 29.09 ml of 0.2828 M NaOH for titration. Another 43.00 ml amount of this sample required 7.88 ml of 0.1505 M AgNO3 for titration. Calculate the mass percent of HNO3 (molar mass = 63.018 g/mol) in the sample.

Homework Equations

The Attempt at a Solution

I know that you have to calculate the total number of mols of acid, but I'm not where to even start to do that.

 

[Borek]

Start with writing all reaction equations. Three of them.