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Problem- Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). change in pH =? 2. Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution. change in pH = ?

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