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bryceisabeast6206
09.06.2021 •
Chemistry
Identify each described physical separation technique. A liquid is carefully poured out, leaving the solid behind in the container. Choose... A solid is caught on paper or a membrane while the liquid passes through. Choose... A solid mixture is heated. One component transitions directly between solid and gas. Choose... A solvent is added to dissolve only one mixture component and then the liquids are separated.
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Ответ:
CN^-1 + H2O --> HCN + OH^-1
The amount is based on the hydrolysis constant which is
Kw / KaHCN = 1 X 10^-14 / 3 X 10^-9
= 3.333 X 10 ^-6
0.2 M CN^-1 will ionize to a small extent ( A ) to produce A amounts of HCN and A amounts of OH^-1
soo Kh = 3.333 X 10^-6 = [A][A] / 0.2 -A
but A <<< 0.2 ( much lesser than) so it will be omitted in the denominator
A^2 = 0.2 x 3.333 X 10^-6
A^2= 6.67 X 10^-7
A= 8.17 X 10^-4
pOH = -log ( 8.17 X 10^-4 ) = 3.09
then ph is
pH = 14 - pOH
so
pH = 14 - 3.09
pH = 10.91