o 12/8/2014 1 1:00 PM 0 6/201 2/5/2014 10:23 PM Gradebook Print Calculator -d Pe

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o 12/8/2014 1 1:00 PM 0 6/201 2/5/2014 10:23 PM Gradebook Print Calculator -d Periodic Table Question 4 of 10 eneral Chemist Donald McQuarrie. Peter A. Rock Ethan Gallogly id University Science Books presented by Sapling Learning Calculate the change in pH when 6.00 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 NH4CI(aq). Number Calculate the change in pH when 6.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution. 100 M NaOMH(aql is added to Number O Previous Give Up & View Solution O Check Answer 0 Next a Exit

Explanation / Answer

pH = pKa + log [salt] / [acid]

if we have added 6mL of 0.1M HCl

so millimoles of HCl is 0.1 X 6 = 0.6 millimoles = 0.0006 moles

these will increase the conc of acid and will decrease the conc of salt by the same amount

pH = pKa + log [0.1-0.0006] / [0.1 + 0.006]

pH = 4.75 + log (0.094 / 0.1006]

pH = 4.75

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