pH expresses the molar concentration of hydronium ions in an aqueous solution on
ID: 185352 • Letter: P
Question
pH expresses the molar concentration of hydronium ions in an aqueous solution on a logarithmic scale. (Note that it is common to use the hydrogen ion, H , to represent the hydronium ion, H3O .) + -p [H3O] = 10 As pH decreases, acidity increases. As pH increases, acidity decreases Acidic solution: pH 7 -14 What is the pH of an aqueous solution with the hydronium ion concentration : [H301-2 x 10 . M ? Provide your answer to the tenth of a pH unit. 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? Provide your answer with three significant figures. Answer may be in long form or scientific notation. The form of 0.123 in scientific notation is 1.23e-1, where "e" represents "x10" and the number after the "e" is the exponent term.Explanation / Answer
1.[H3O+] = 2*10-14 M
pH =-log [H3O+]
=-log[ 2* 10-14]
= - ( -13.7)
= 13.7 (ans)
2.[H3O+] = 10-pH or
[H3O+] = antilog (- pH)
3.120 = - log [H3O+]
- 3.120 = log [H3O+]
[H3O+] = 10-3.120
= 0.000758577575029 M ans.
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