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What mass of ammonium chloride should be added to 2.50 L of a 0.155 M NH3...

What mass of ammonium chloride should be added to 2.50 L of a 0.155 M NH3 in order to obtain a buffer with a pH of 9.60? Express your answer using two significant figures.

Consider the titration of a 21.0 −mL sample of 0.105 M HC2H3O2 with 0.120 M NaOH. Determine each of the following.

Part A

the initial pH

Express your answer using two decimal places.
pH =

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Part B

the volume of added base required to reach the equivalence point
V =   mL  

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Part C

the pH at 6.00 mL of added base

Express your answer using two decimal places.
pH =

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