What is the ph of the of a buffer solution by adding 15.0 g of ammonium...

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What is the ph of the of a buffer solution by adding 15.0 g of ammonium chloride to 5 L of 0.20 M ammonia= answer is 9.8 but i need help with

what is the ph of the buffer after 90.0mL of 2.00M HCL are added answer is 9.50 help?

what is the ph of the buffer after 15.00 g of naoh are added? answer is 12.28

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