Question 998735
The pH scale for acidity is defined by pH=−log 10 [H + ] where [H + ] is the concentration of hydrogen ions measured in moles per liter (M).
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(A) The pH of Milk of Magnesia is 10.5. 

Calculate the concentration of hydrogen ions in moles per liter (M).
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10.5 = -log10[H+]
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log10[H+] = - 10.5
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[H +] = 10^(-10.5) = 3.162..x10^-11
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= 0.0000000003162_M
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Cheers,
Stan H.