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What is the pH of a buffer solution prepared by adding 15.0 g of ammonia chloide...

What is the pH of a buffer solution prepared by adding 15.0 g of ammonia chloide to 5.00 L of 0.200 M ammonia? Ka of ammonium is 5.8 x 10^-10

2) What is the pH of the buffer after 90.0mL of 2.00 M HCl are added?

3) What is the pH of the buffer if 15.00 g of NaOH is added to the original buffer solution?

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