Solution A has a pH of 3.8, and solution B has a pH of 7.7. Which solution is mo

Question

Solution A has a pH of 3.8, and solution B has a pH of 7.7. Which solution is more acidic? What is the [H_3O^+] in solution A? Express your answer to one significant figures and include the appropriate units. What is the[H_3O^+] in solution B? Express your answer to one significant figures and include the appropriate units. What is the [OH^-] in solution A? Express your answer to one significant figures and include the appropriate units. What is the [OH^-] in solution B? Express your answer to one significant figures and include the appropriate units.

Explanation / Answer

We know that

pH will be less than 7 if solution is acidic and if will be greater than 7 it will be Basic

So less is the pH than 7, higher is the Acidity

Part A)

Solution A having pH 3.8 and Solution B having pH 7.7

So Solution A is more Acidic than B

Part B)

We know that

pH = -log [H+] = -log [H3O+]

then for solution A

[H3O+] = 10-pH

= 10-3.8 = 0.00016 approx = 1.6 x 10-4 M

Part C ) same for solution B

[H3O+] = 10-pH

= 10-7.7 = 2 x 10-8 M

Part D)

We need to Find [OH-]

So we need pOH for solution A

We know that pH + pOH =14 , then pOH = 14 - 3.8 = 10.2

And pOH = -log[OH-]

then

[OH-] = 10-pOH

= 10-10.2

= 6.3 x 10-11 M

Part E)

same as above for solution B

[OH-] = 10-pOH

= 10-(14-7.7)

= 5 x 10-7 M

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