Question

In: Chemistry

1.Calculate the [H3O+] value of each aqueous solution. aspirin with [OH−]=1.4×10−11M. seawater with [OH−]=1.5×10−6M 2. To...

1.Calculate the [H3O+] value of each aqueous solution.

aspirin with [OH−]=1.4×10−11M.

seawater with [OH−]=1.5×10−6M

2. To calculate pH and use it as a measure of acidity.

What is the pH of an aqueous solution with [H3O+] = 4×10⁻¹³M ?

Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid.

What is the molar concentration of H3O+ in a cola that has a pH of 3.120?

Expert Solution

1. Kw = [H3O+][OH-]

[H3O+] = Kw/[OH-]

= 1*10^-14/1.4*10^-11 = 0.000714M

sea water

Kw = [H3O+][OH-]

[H3O+] = Kw/[OH-]

= 1*10^-14/1.5*10^-6 = 6.7*10^-9 M

2.

[H3O+] = 4×10⁻¹³M

PH = -log[H3O+]

= -log4*10^-13

= 12.3979

3.PH = 3.120

-log[H3O+] = pH

-log[H3O+] = 3.120

[H3O+] = 10^-3.12 = 0.0007585M = 7.6*10^-4 M >>>>answer

queen_honey_blossom answered 3 years ago

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