he pH Scale earning Goal: To calculate pH and use it as a measure of acidity The

Question

he pH Scale earning Goal: To calculate pH and use it as a measure of acidity The pHexpresses the molar concentration of hydronium ions in an aqueous solution on a logarithmic scale pH As pH decreases, acidity increases. As pH increases, acidity decreases Acidic solution: pH 7 Part A What is the pH of an aqueous solution with Hao1-6x10-12M? Express the pH numerically using one decimal place. Submit Hints MeAnswers Gve Up Review Part Incorrect: Try Again: 5 attempts remaining The pHis not necessant equal in magnitude to the exponentin the concent significant figures in your answer You may need to review LoganthmicExpressionsnivoting pH Part B carbonated cola more acidic than coffee even orange juice because cola cont What is the molar concentration of Easo in a cota that has a pH of3.120? Express your answer with the appropriate units,

Explanation / Answer

Part A) Given , [H3O+] =6 x 10-12 M

so PH = - log (6 x 10-12 )

= -(0.78-12)

=11.22

=11.2 (to one decimal place)

Part B) Given , PH =3.120

So, [H3O+] = 10-3.120

=7.58 x 10-4 M or 7.58 x 10-4 mol /L

Part C) pH < 7 (acidic) ,pH = 7(neutral) and pH >7(basic)

We are given these values,

[H3O+] = 10-2 , so pH =-log 10-2 =2 (most acidic)

PH =3 (most acidic)

pH =3.5 (most acidic)

[H3O+] =10-4 , so PH =-log 10-4 = 4 (most acidic)

and PH =10 (least acidic) ,it is basic

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