NAME Calculate the pH of the following aqueous solutions 5 p

NAME: Calculate the pH of the following aqueous solutions. (5 pts each) 7) 0.34 M CsHsNH3NO3 9) 0.67 M Ca(CN)2

concentration of C6H5NH3NO3 = 0.34 M

this is a salt of weak base and strong acid. so pH < 7

pKb of C6H5NH2 = 9.13

pH = 7 - 1/2 (pKb + log C)

= 7 - 1/2 (9.13 + log 0.34)

pH = 2.67

concentration of Ca(CN)2 = 0.67 M

this is a salt of strong base and weak acid.so pH > 7

pKa of HCN = 9.21

pH = 7 + 1/2 (pKa + log C)

= 7 + 1/2 (9.21 + log 0.67)

pH = 11.52