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Water flowing through pipes of carbon steel must be kept at pH 5 or greater to limit corrosion. If an 8.0X10³ lb/h water stream contains 10 ppm sulfuric acid and 0.015% acetic acid, how many pounds per hour of sodium acetate trihydrate must be added to maintain that pH?

Respuesta :

(CH3)2NH2+of PKb=10.77 and acetate ion of PKb =12.04

Steps

Kb of acetate ion can be calculated by

[tex]\begin{align} K_{b} &= \frac{K_{w}}{K_{a}}\\ &= \frac{1\times 10^{-14}}{1\times10^{-2}} \\ &= 9.09 \times 10^{-13} \end{align}[/tex][tex]Kb=\frac{Kw}{Ka} \\[/tex]

 =1×10^−2/1×10^−14

=9.09x 10^-13

we have the Kb value, we can now compute the pKb value using the formula below

​PKb= -logKb

​PKb=-log(9.09x 10^-13)

​PKb=12.04

The Kb of (CH3)2NH2+ can be calculated as

[tex]\begin{align} K_{b} &= \frac{K_{w}}{K_{a}}\\ &= \frac{1\times 10^{-14}}{1\times10^{-2}} \\ &= 9.09 \times 10^{-13} \end{align}[/tex][tex]Kb=\frac{Kw}{Ka} \\[/tex]

=1×10^−14/5.9x10^−4

=1.7x10^-11

we have the Kb value, we can now compute the pKb value using the formula below

​PKb= -logKb

​PKb=-log(1.7x 10^-11)

PKb=10.77

learn more about pH here

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