Calculate the amount of (NH4)2SO4 (in gram) which must be added to 1 L – InterviewSolution

1.	Calculate the amount of (NH4)2SO4 (in gram) which must be added to 1 L solution of 0.2 M NH4OH to yield a solution of pH=9.35 at 25oC. (Assume volume is not changing during the reaction) Kb for NH4OH is 1.8×10−5 Take log 1.8=0.25 and 100.1=1.25
Answer» Calculate the amount of $(N H_{4})_{2} S O_{4}$ (in gram) which must be added to $1 L$ solution of $0.2 M$ $N H_{4} O H$ to yield a solution of $p H = 9.35$ at $25^{o} C$ . (Assume volume is not changing during the reaction) $K_{b}$ for $N H_{4} O H$ is $1.8 \times 10^{- 5}$ Take $log 1.8 = 0.25 a n d 10^{0.1} = 1.25$

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