1. I don't know the details of your experiment but I suspect AgNO3 is, indeed, a primary standard. How you explain that is up to you.
2. Too basic and you have problems with Ag(OH)2.
3. moles KCl = grams/molar mass
moles KI = grams/molar mass
Total Cl and I = sum of the two.
Amount titrated is sum x (25/100) = ?
moles AgNO3 used = moles in the 25 mL aliquot.
M AgNO3 = moles AgNO3/L AgNO3. Solve for L and convert to mL.
If performing a potentiometric halide titration with Ag+:
1. Is siver nitrate a primary standard? Explain.
2. What is the purpose of using a bisulfate buffer?
3. Have 1.0000 grams of unknown, containing .3000g KCl and .7000g KI. You dissolve in 100 mL of water then use an aliquot of 25mL for titration. How many milliliters of 0.700 M AgNO3 would you expect the mixture to consume?
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