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12 Dec 2019

Calculate the pH of a 0.4310 M aqueous solution of sodium dihydrogen phosphate, NaH2PO4.

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Acid/Base Ionization Constants at 25 oC

Acid

Formula

Ka1

Ka2

Ka3

Acetic acid

CH3COOH

1.8 × 10-5

Acetylsalicylic acid (aspirin)

HC9H7O4

3.0 × 10-4

Aluminum ion

Al(H2O)43+

1.2 × 10-5

Arsenic acid

H3AsO4

2.5 × 10-4

5.6 × 10-8

3.0 × 10-13

Ascorbic acid

H2C6H6O6

7.9 × 10-5

1.6 × 10-12

Benzoic acid

C6H5COOH

6.3 × 10-5

Carbonic acid

H2CO3

4.2 × 10-7

4.8 × 10-11

Ferric ion

Fe(H2O)63+

4.0 × 10-3

Formic acid

HCOOH

1.8 × 10-4

Hydrocyanic acid

HCN

4.0 × 10-10

Hydrofluoric acid

HF

7.2 × 10-4

Hydrogen peroxide

H2O2

2.4 × 10-12

Hydrosulfuric acid

H2S

1.0 × 10-7

1.0 × 10-19

Hypochlorous acid

HClO

3.5 × 10-8

Nitrous acid

HNO2

4.5 × 10-4

Oxalic acid

H2C2O4

5.9 × 10-2

6.4 × 10-5

Phenol

C6H5OH

1.0 × 10-10

Phosphoric acid

H3PO4

7.5 × 10-3

6.2 × 10-8

3.6 × 10-13

Sulfuric acid

H2SO4

very large

1.2 × 10-2

Sulfurous acid

H2SO3

1.7 × 10-2

6.4 × 10-8

Zinc ion

Zn(H2O)42+

2.5 × 10-10

Base

Formula

Kb

Ammonia

NH3

1.8 × 10-5

Aniline

C6H5NH2

7.4 × 10-10

Caffeine

C8H10N4O2

4.1 × 10-4

Codeine

C18H21O3N

8.9 × 10-7

Diethylamine

(C2H5)2NH

6.9 × 10-4

Dimethylamine

(CH3)2NH

5.9 × 10-4

Ethylamine

C2H5NH2

4.3 × 10-4

Hydroxylamine

NH2OH

9.1 × 10-9

Isoquinoline

C9H7N

2.5 × 10-9

Methylamine

CH3NH2

4.2 × 10-4

Morphine

C17H19O3N

7.4 × 10-7

Piperidine

C5H11N

1.3 × 10-3

Pyridine

C5H5N

1.5 × 10-9

Quinoline

C9H7N

6.3 × 10-10

Triethanolamine

C6H15O3N

5.8 × 10-7

Triethylamine

(C2H5)3N

5.2 × 10-4

Trimethylamine

(CH3)3N

6.3 × 10-5

Urea

N2H4CO

1.5 × 10-14

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Sixta Kovacek
Sixta KovacekLv2
13 Dec 2019

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Related questions

I've noticed that recently most of my chemistry questions that get answered have also been incorrect. I cant help but feel like this is a discrepncy between either the methods used, or the values of the refreances when choosing Ka,Ksp,Kb, costants of the nature. In order to avoid this I will post 2 pictures. The fisrt one will be the question I am asking, and the second one will be a worked question of similar nature that I missed. I will also post the refrences that I am using. Please use the numbers off those refernces or the answer will be wrong. Thanks

asking:missed:

Charts:

Ksp-

BromidesPbBr26.3 × 10-6

AgBr3.3 × 10-13CarbonatesBaCO38.1 × 10-9

CaCO33.8 × 10-9

CoCO38.0 × 10-13

CuCO32.5 × 10-10

FeCO33.5 × 10-11

PbCO31.5 × 10-13

MgCO34.0 × 10-5

MnCO31.8 × 10-11

NiCO36.6 × 10-9

Ag2CO38.1 × 10-12

ZnCO31.5 × 10-11ChloridesPbCl21.7 × 10-5

AgCl1.8 × 10-10ChromatesBaCrO42.0 × 10-10

CaCrO47.1 × 10-4

PbCrO41.8 × 10-14

Ag2CrO49.0 × 10-12CyanidesNi(CN)23.0 × 10-23

AgCN1.2 × 10-16

Zn(CN)28.0 × 10-12FluoridesBaF21.7 × 10-6

CaF23.9 × 10-11

PbF23.7 × 10-8

MgF26.4 × 10-9HydroxidesAgOH2.0 × 10-8

Al(OH)31.9 × 10-33

Ca(OH)27.9 × 10-6

Cr(OH)36.7 × 10-31

Co(OH)22.5 × 10-16

Cu(OH)21.6 × 10-19

Fe(OH)27.9 × 10-15

Fe(OH)36.3 × 10-38

Pb(OH)22.8 × 10-16

Mg(OH)21.5 × 10-11

Mn(OH)24.6 × 10-14

Ni(OH)22.8 × 10-16

Zn(OH)24.5 × 10-17IodidesPbI28.7 × 10-9

AgI1.5 × 10-16OxalatesBaC2O41.1 × 10-7

CaC2O42.3 × 10-9

MgC2O48.6 × 10-5PhosphatesAlPO41.3 × 10-20

Ba3(PO4)21.3 × 10-29

Ca3(PO4)21.0 × 10-25

CrPO42.4 × 10-23

Pb3(PO4)23.0 × 10-44

Ag3PO41.3 × 10-20

Zn3(PO4)29.1 × 10-33SulfatesBaSO41.1 × 10-10

CaSO42.4 × 10-5

PbSO41.8 × 10-8

Ag2SO41.7 × 10-5SulfidesCaS8 × 10-6

CoS5.9 × 10-21

CuS7.9 × 10-37

FeS4.9 × 10-18

Fe2S31.4 × 10-88

PbS3.2 × 10-28

MnS5.1 × 10-15

NiS3.0 × 10-21

Ag2S1.0 × 10-49

ZnS2.0 × 10-25SulfitesBaSO38.0 × 10-7

CaSO31.3 × 10-8

Ag2SO31.5 × 10-14

Ka&Kb-

Acetic acid

CH3COOH

1.8 × 10-5

Acetylsalicylic acid (aspirin)

HC9H7O4

3.0 × 10-4

Aluminum ion

Al(H2O)43+

1.2 × 10-5

Arsenic acid

H3AsO4

2.5 × 10-4

5.6 × 10-8

3.0 × 10-13

Ascorbic acid

H2C6H6O6

7.9 × 10-5

1.6 × 10-12

Benzoic acid

C6H5COOH

6.3 × 10-5

Carbonic acid

H2CO3

4.2 × 10-7

4.8 × 10-11

Ferric ion

Fe(H2O)63+

4.0 × 10-3

Formic acid

HCOOH

1.8 × 10-4

Hydrocyanic acid

HCN

4.0 × 10-10

Hydrofluoric acid

HF

7.2 × 10-4

Hydrogen peroxide

H2O2

2.4 × 10-12

Hydrosulfuric acid

H2S

1.0 × 10-7

1.0 × 10-19

Hypochlorous acid

HClO

3.5 × 10-8

Nitrous acid

HNO2

4.5 × 10-4

Oxalic acid

H2C2O4

5.9 × 10-2

6.4 × 10-5

Phenol

C6H5OH

1.0 × 10-10

Phosphoric acid

H3PO4

7.5 × 10-3

6.2 × 10-8

3.6 × 10-13

Sulfuric acid

H2SO4

very large

1.2 × 10-2

Sulfurous acid

H2SO3

1.7 × 10-2

6.4 × 10-8

Zinc ion

Zn(H2O)42+

2.5 × 10-10

Base

Formula

Kb

Ammonia

NH3

1.8 × 10-5

Aniline

C6H5NH2

7.4 × 10-10

Caffeine

C8H10N4O2

4.1 × 10-4

Codeine

C18H21O3N

8.9 × 10-7

Diethylamine

(C2H5)2NH

6.9 × 10-4

Dimethylamine

(CH3)2NH

5.9 × 10-4

Ethylamine

C2H5NH2

4.3 × 10-4

Hydroxylamine

NH2OH

9.1 × 10-9

Isoquinoline

C9H7N

2.5 × 10-9

Methylamine

CH3NH2

4.2 × 10-4

Morphine

C17H19O3N

7.4 × 10-7

Piperidine

C5H11N

1.3 × 10-3

Pyridine

C5H5N

1.5 × 10-9

Quinoline

C9H7N

6.3 × 10-10

Triethanolamine

C6H15O3N

5.8 × 10-7

Triethylamine

(C2H5)3N

5.2 × 10-4

Trimethylamine

(CH3)3N

6.3 × 10-5

Urea

N2H4CO

1.5 × 10-14

I've noticed that recently most of my chemistry questions that get answered have also been incorrect. I cant help but feel like this is a discrepncy between either the methods used, or the values of the refreances when choosing Ka,Ksp,Kb, costants of the nature. In order to avoid this I will post 2 pictures. The fisrt one will be the question I am asking, and the second one will be a worked question of similar nature that I missed. I will also post the refrences that I am using. Please use the numbers off those refernces or the answer will be wrong. Thank

Asking:

Missing:

Charts:

Ksp-

BromidesPbBr26.3 × 10-6

AgBr3.3 × 10-13CarbonatesBaCO38.1 × 10-9

CaCO33.8 × 10-9

CoCO38.0 × 10-13

CuCO32.5 × 10-10

FeCO33.5 × 10-11

PbCO31.5 × 10-13

MgCO34.0 × 10-5

MnCO31.8 × 10-11

NiCO36.6 × 10-9

Ag2CO38.1 × 10-12

ZnCO31.5 × 10-11ChloridesPbCl21.7 × 10-5

AgCl1.8 × 10-10ChromatesBaCrO42.0 × 10-10

CaCrO47.1 × 10-4

PbCrO41.8 × 10-14

Ag2CrO49.0 × 10-12CyanidesNi(CN)23.0 × 10-23

AgCN1.2 × 10-16

Zn(CN)28.0 × 10-12FluoridesBaF21.7 × 10-6

CaF23.9 × 10-11

PbF23.7 × 10-8

MgF26.4 × 10-9HydroxidesAgOH2.0 × 10-8

Al(OH)31.9 × 10-33

Ca(OH)27.9 × 10-6

Cr(OH)36.7 × 10-31

Co(OH)22.5 × 10-16

Cu(OH)21.6 × 10-19

Fe(OH)27.9 × 10-15

Fe(OH)36.3 × 10-38

Pb(OH)22.8 × 10-16

Mg(OH)21.5 × 10-11

Mn(OH)24.6 × 10-14

Ni(OH)22.8 × 10-16

Zn(OH)24.5 × 10-17IodidesPbI28.7 × 10-9

AgI1.5 × 10-16OxalatesBaC2O41.1 × 10-7

CaC2O42.3 × 10-9

MgC2O48.6 × 10-5PhosphatesAlPO41.3 × 10-20

Ba3(PO4)21.3 × 10-29

Ca3(PO4)21.0 × 10-25

CrPO42.4 × 10-23

Pb3(PO4)23.0 × 10-44

Ag3PO41.3 × 10-20

Zn3(PO4)29.1 × 10-33SulfatesBaSO41.1 × 10-10

CaSO42.4 × 10-5

PbSO41.8 × 10-8

Ag2SO41.7 × 10-5SulfidesCaS8 × 10-6

CoS5.9 × 10-21

CuS7.9 × 10-37

FeS4.9 × 10-18

Fe2S31.4 × 10-88

PbS3.2 × 10-28

MnS5.1 × 10-15

NiS3.0 × 10-21

Ag2S1.0 × 10-49

ZnS2.0 × 10-25SulfitesBaSO38.0 × 10-7

CaSO31.3 × 10-8

Ag2SO31.5 × 10-14

Ka&Kb-

Acetic acid

CH3COOH

1.8 × 10-5

Acetylsalicylic acid (aspirin)

HC9H7O4

3.0 × 10-4

Aluminum ion

Al(H2O)43+

1.2 × 10-5

Arsenic acid

H3AsO4

2.5 × 10-4

5.6 × 10-8

3.0 × 10-13

Ascorbic acid

H2C6H6O6

7.9 × 10-5

1.6 × 10-12

Benzoic acid

C6H5COOH

6.3 × 10-5

Carbonic acid

H2CO3

4.2 × 10-7

4.8 × 10-11

Ferric ion

Fe(H2O)63+

4.0 × 10-3

Formic acid

HCOOH

1.8 × 10-4

Hydrocyanic acid

HCN

4.0 × 10-10

Hydrofluoric acid

HF

7.2 × 10-4

Hydrogen peroxide

H2O2

2.4 × 10-12

Hydrosulfuric acid

H2S

1.0 × 10-7

1.0 × 10-19

Hypochlorous acid

HClO

3.5 × 10-8

Nitrous acid

HNO2

4.5 × 10-4

Oxalic acid

H2C2O4

5.9 × 10-2

6.4 × 10-5

Phenol

C6H5OH

1.0 × 10-10

Phosphoric acid

H3PO4

7.5 × 10-3

6.2 × 10-8

3.6 × 10-13

Sulfuric acid

H2SO4

very large

1.2 × 10-2

Sulfurous acid

H2SO3

1.7 × 10-2

6.4 × 10-8

Zinc ion

Zn(H2O)42+

2.5 × 10-10

Base

Formula

Kb

Ammonia

NH3

1.8 × 10-5

Aniline

C6H5NH2

7.4 × 10-10

Caffeine

C8H10N4O2

4.1 × 10-4

Codeine

C18H21O3N

8.9 × 10-7

Diethylamine

(C2H5)2NH

6.9 × 10-4

Dimethylamine

(CH3)2NH

5.9 × 10-4

Ethylamine

C2H5NH2

4.3 × 10-4

Hydroxylamine

NH2OH

9.1 × 10-9

Isoquinoline

C9H7N

2.5 × 10-9

Methylamine

CH3NH2

4.2 × 10-4

Morphine

C17H19O3N

7.4 × 10-7

Piperidine

C5H11N

1.3 × 10-3

Pyridine

C5H5N

1.5 × 10-9

Quinoline

C9H7N

6.3 × 10-10

Triethanolamine

C6H15O3N

5.8 × 10-7

Triethylamine

(C2H5)3N

5.2 × 10-4

Trimethylamine

(CH3)3N

6.3 × 10-5

Urea

N2H4CO

1.5 × 10-14

What is the pH of a solution made by dissolving 4.3 g of K2CO3 and 1.6 g of KHCO3 in 500. mL of water? (See the appendix.)

Table 3 An Acid-base table
Acid Name ConjugateAcid Ka pKa Conjugate Base Base Name
perchloric acid HClO4 >>1 < 0 ClO41- perchlorate ion
hydrohalic acid HX (X=I,Br,Cl) >>1 < 0 X1- halide ion
sulfuric acid H2SO4 >>1 < 0 HSO41- hydrogen sulfate ion
nitric acid HNO3 >>1 < 0 NO31- nitrate ion
hydronium ion H3O1+ 1.0 0.00 H2O water
iodic acid HIO3 0.17 0.77 IO31- iodate ion
oxalic acid H2C2O4 5.9 x 10-2 1.23 HC2O41- hydrogen oxalate ion
sulfurous acid H2SO3 1.5 x 10-2 1.82 HSO31- hydrogen sulfite ion
hydrogen sulfate ion HSO41- 1.2 x 10-2 1.92 SO42- sulfate ion
phosphoric acid H3PO4 7.5 x 10-3 2.12 H2PO41- dihydrogen phosphate ion
hydrofluoric acid HF 7.2 x 10-4 3.14 F1- fluoride ion
nitrous acid HNO2 4.0 x 10-4 3.40 NO21- nitrite ion
lactic acid HC3H5O3 6.4 x 10-5 3.85 C3H5O31- lactate ion
formic acid HCHO2 1.8 x 10-4 3.74 CHO21- formate ion
hydrogen oxalate ion HC2O41- 6.4 x 10-5 4.19 C2O42- oxalate ion
hydrazoic acid HN3 1.9 x 10-5 4.72 N31- azide ion
acetic acid HC2H3O2 1.8 x 10-5 4.74 C2H3O21- acetate ion
carbonic acid H2CO3 4.3 x 10-7 6.37 HCO31- hydrogen carbonate ion
hydrogen sulfite ion HSO31- 1.0 x 10-7 7.00 SO32- sulfite ion
hydrosulfuric acid H2S 1.0 x 10-7 7.00 HS1- hydrogen sulfide ion
dihydrogen phosphate ion H2PO41- 6.2 x 10-8 7.21 HPO42- hydrogen phosphate ion
hypochlorous acid HClO 3.5 x 10-8 7.46 ClO1- hypochlorite ion
ammonium ion NH41+ 5.6 x 10-10 9.25 NH3 ammonia
hydrocyanic acid HCN 4.0 x 10-10 9.40 CN1- cyanide ion
hydrogen carbonate ion HCO31- 4.7 x 10-11 10.33 CO32- carbonate ion
hydrogen phosphate ion HPO42- 4.8 x 10-13 12.32 PO43- phosphate ion
hydrogen sulfide ion HS1- 1.3 x 10-13 12.89 S2- sulfide ion
water H2O 1.0 x 10-14 14.00 OH1- hydroxide ion
ammonia NH3 <<10-14 NH21- amide ion
hydroxide ion OH1- <<10-14 O2- oxide ion

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