Question

What is the pH of a buffer if 12.2 grams of sodium hydrogen phosphate and 12.2 g of sodium

dihydrogen phosphate are added to 200 ml of distilled water? What is the molarity of phosphate ion in

this buffer?

**How many grams of sodium hydrogen phosphate and sodium dihydrogen phosphate are needed

to make 300 mL of a 0.12 M phosphate buffer with a pH of 7.2.

** How many grams of sodium hydrogen phosphate and sodium dihydrogen phosphate are needed

to make 500 mL of a 0.16 M phosphate buffer with a pH of 7.3.

**How many grams of sodium hydrogen phosphate and sodium dihydrogen phosphate are needed

to make a liter of 0.08 M phosphate buffer with a pH of 6.8.