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aksik [14]
3 years ago
5

12. Calculate the hydroxide ion concentration of a solution with pH = 10.25. Show all calculations leading to an answer.

Chemistry
2 answers:
Alex787 [66]3 years ago
6 0
PH= log[H3O+]
10.25=log [H3O+]
[H3O+] = 10^10.25
[H3O+]= 1.778 ×10^10
kkurt [141]3 years ago
6 0
<span>pH + pOH = 14 10.25 + pOH = 14 pOH = 14 - 10.25 = 3.75 Now, knowing the pOH we can find the OH^- since pOH is -log [OH-] [OH-] = 10^-3.75 = 1.78x10^-4 M</span>
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Answer:

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A student dissolved 5.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?

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Mass of  NO3- in final solution is mole x Molar mass of NO3

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