Experiment 5: In chemistry, pH s a measure of the acidity or basicity of an aque

Question

Experiment 5: In chemistry, pH s a measure of the acidity or basicity of an aqueous solution. Although advanced quantitative pH- considerations often result n fairly acidic calculations, even a basic qualitative pH-assessment requires a good understanding of elemental concepts and ideas. Thus, you should be able to provide a meaningful answer to the following essential questions: 1. How is pH related to the concentration of hydrogen cations 2. What is understood by the auto-ionization of water? 3. What is the ion product of water? 4. What is the pH of a neutral aqueous solution (neither acidic nor basic)? 5. How is the pH of a neutral aqueous solution related to the ion product of water? 6. How is pH related to the concentration of hydroxide anions [OH^-]? 7. How many significant figures are contained in the following value: pOH = 10.45? 8. What is a pH indicator?

Explanation / Answer

1. pH= -log [H+]

2. This is also known as Self ionization where in loses hydrogen and becomes OH-. The H+ reacts with H2O to becme H3O+

2H2O---- > H3O+ OH-

3. Ionc prodcut of water is the equilibrium constanr of water where water undergoing self ionization

H2O(l) + H2O(l) = H3O+(aq) + OH-(aq)

Kw= [H3O+][OH-]

4. The pH of neutral solution is 7

5. kw= [H3O+] [OH-]

for neutral solution PH=POH= 7

H+ =OH- =10-7

Kw= 10-7*10-7 =10-14

7. There are two significant digits in pOh= 10.45 (0.45)

-log [OH-] = 10.45

OH= 10-10.45 = 3.5X10-11 M

8. Ph indicator is a chemical that detects the concentration of [H+]. The indicator changes the color of the solution depending upon the concentration of [H+]

8.

6. pH+ + POH- =14   pH= -log [H+] snnd pOH- =-log[OH-]

7.

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