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Calcium hydroxide, Ca(OH)2, is used as a calcium nutritional supplement in some foods and beverages, such as orange juice. What is the pH of a solution of 0.0012M calcium hydroxide at 25.0∘C?

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sebassandin

Answer:

[tex]pH=11.08[/tex]

Explanation:

Hello,

In this case, since calcium hydroxide a strong base, its dissociation will completely result in both calcium and hydroxyl ions:

[tex]Ca(OH)_2\rightarrow Ca^{2+}+OH^-[/tex]

Thus, the concentration of hydroxyl ions equals that of the calcium hydroxide, with which we could compute the pOH as shown below:

[tex]pOH=-log([OH^-]}=-log(0.0012)\\\\pOH=2.92[/tex]

Now, the pH and the pOH are related by:

[tex]pOH+pH=14[/tex]

Hence, the pH finally results:

[tex]pH=14-pOH=14-2.92\\pH=11.08[/tex]

Best regards.

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