Answer to Question #182528 in Inorganic Chemistry for Poakimba Godsway Adje

Question #182528

What is the pH of a solution prepared by adding 0.2g of Na2CO3 and 0.2g of NaHCO3 to water and bringing to a volume of 1liter? (pKa2=10.25)


1
Expert's answer
2021-04-19T08:50:56-0400

Moles of Na2CO3=Na_2CO_3= 0.2g105.99g/mol0.2g\over 105.99g/mol =0.00199moles=0.00199moles

Molarity=0.00199moles1L0.00199moles\over 1L U=1.90×103MU=1.90\times 10^{-3} M

Moles of NaHCO3=NaHCO_3= 0.2g84.007g/mol0.2g\over 84.007g/mol 0.00239moles0.00239moles

Molarity of == 0.00239moles1L0.00239moles\over 1L =2.39×103M=2.39\times 10^{-3} M

pH=pKa2+log[HCO32/pCO2]pH=pKa_2+log[HCO_3^{2-}/pCO-2]

pH=10.25+log2.39×103pH=10.25+log2.39\times 10^{-3}

pH=10.25+(0.924)=9.32pH=10.25+(-0.924)=9.32


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