What mass of potassium hypochlorite (fw-90.6 g/mol) must be added to 4.50 x 10 ml of water to give a solution with ph 10.20? [ka(hcio) 4.0 x 10-8] 0.032g ? 2.4 g 04.1 g 9.1 g 20. g
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Ответ:
Answer : The mass of potassium hypochlorite is, 4.1 grams.
Explanation : Given,
pH = 10.20
Volume of water =![4.50\times 10^2ml=0.45L](/tpl/images/0055/2981/d0221.png)
The decomposition of KClO will be :
Now the further reaction with water
to give,
First we have to calculate the pOH.
Now we have to calculate the
concentration.
Now we have to calculate the base dissociation constant.
Formula used :![K_b=\frac{K_w}{K_a}](/tpl/images/0055/2981/67bbd.png)
Now put all the given values in this formula, we get :
Now we have to calculate the concentration of
.
The equilibrium constant expression of the reaction is:
As we know that,![[OH^-]=[HClO]=1.58\times 10^{-4}M](/tpl/images/0055/2981/ec220.png)
Now we have to calculate the moles of
.
As we know that, the number of moles of
are equal to the number of moles of KClO.
So, the number of moles of KClO = 0.0449 mole
Now we have to calculate the mass of KClO.
Therefore, the mass of potassium hypochlorite is, 4.1 grams.
Ответ:
.
Step-by-step explanation: