Calculate [H3O+] in the following solutions. 1) 3.0×10 ?2 M HCl and 7.5×10 ?2 M

Question

Calculate [H3O+] in the following solutions.

1) 3.0×10?2 M HCl and 7.5×10?2 M HOCl

2) 0.100 M NaNO2 and 5.50×10?2 M HNO2

3) 5.35×10?2 M HCl and 7.66×10?2 M NaC2H3O2

Question 1 Calculate H30 in the following solutions Part A 3.0x10-2 M HCl and 7.5x10-2 M HOCl Express your answer using two significant figures CH30 Submit My Answers Give U Incorrect, Try Again, 4 attempts remaining Part B 0.100 M NaNO2 and 5.50x 10-2 M HNO Express your answer using two significant figures CH30 4.246 10 Submit My Answers Give U Incorrect, Try Again, 4 attempts remaining Part C 5.35x10 2 M HCl and 7.66x 10 2 M NaC2H30 Express your answer using two significant figures M

Explanation / Answer

Part A)

concentration of [H3O+] = 3.0 x 10^-2 M

Part B)

pH = pKa + log [NaNP2 / HNO2]

    = 3.25 + log [0.1 / 5.50×102]

    = 3.509

[H3O+] = 10^-3.509

[H3O+] = 3.1 x 10^-4 M

3) 5.35×102 M HCl and 7.66×102 M NaC2H3O2

C2H3O2-    + HCl   ---------------> CH3COOH + Cl -

7.66×102      5.35×102                                  0

2.31 x 10^-2        0                             5.35×102

pH = pKa + log [2.31 x 10^-2 / 5.35×102]

     = 4.74 + log [2.31 x 10^-2 / 5.35×102]

     = 4.375

[H3O+] = 4.2 x 10^-5 M

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