Which of the following describes the principle of conservation of change
a charge is created

b. a charge cannot be transferred

c. charge can not be created or destroyed just transferred
d charge can be destroyed
(i will mark brainliest)

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Ответ:

hannahblank2466

14.12.2021

Chemistry

Answer : The pH of a 0.05 M solution of hydrocyanic acid (HCN) is, 5.305

Solution :

The balanced equilibrium reaction will be,

$HCN\rightleftharpoons H^++CN^-$

The expression for dissociation constant will be,

$k_a=\frac{[H^+][CN^-]}{[HCN]}$

Let the concentration of [H^+] and CN^- will be, 'x'

$4.9\times 10^{-10}=\frac{(x)\times (x)}{0.05}$

$x=4.95\times 10^{-6}M$

That means the concentration of [H^+] and CN^- are $4.95\times 10^{-6}M$

Now we have to calculate the pH.

$pH=-\log [H^+]$

$pH=-\log (4.95\times 10^{-6})$

pH=5.305

Therefore, the pH of a 0.05 M solution of hydrocyanic acid (HCN) is, 5.305

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Which of the following describes the principle of conservation of change a charge is created b. a charge cannot be transferred c. charge can not be created or destroyed just transferred d charge can be destroyed (i will mark brainliest)