1. A buffer solution is made by adding 0.30 moles of ammonium perchlorate (NH4ClO4) and 0.40...
1. A buffer solution is made by adding 0.30 moles of ammonium perchlorate (NH4ClO4) and 0.40 moles of ammonia to 1.0 L of water. If 0.050 mole of sodium hydroxide is added to 500.0 mL of this buffer solution what is the resultant pH (Kb (NH3 ) = 1.8 x 10-5)
a. 4.21
b. 9.65
c. 11.34
d. 5.11
e. 8.38
2. A sample is 0.0010 M in Mg2+ and 0.0010 M in Pb2+. If CO32- ions are slowly added to the solution, what will be the concentration of Pb2+ when the Mg2+ starts to precipitate(Ksp (MgCO3)=6.8 x 10-6 , Ksp (PbCO3)= 7.4×10–14 )
- 1.1 x 10-11 M
- 8.1 x 10-11 M
- 4.1 x 10-6 M
- 1.0 x 10-3 M
- 4.9 x 10-7 M
- Which of the following solutions has a pH of 7.0?
- 1 M HNO3
- 1 M HNO2
- 1 M KNO3
- 1 M KNO2
Homework Answers
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1. A buffer solution is made by adding 0.30 moles of ammonium
perchlorate (NH4ClO4) and 0.40...
a) The pH of an aqueous solution of 5.27×10-2 M ammonium perchlorate, NH4ClO4 (aq), is ________...
a) The pH of an aqueous solution of 5.27×10-2 M ammonium perchlorate, NH4ClO4 (aq), is ________ . This solution is _______ . (acidic, basic, or neutral) b) The pH of an aqueous solution of 0.150 M sodium fluoride, NaF (aq), is ________ . This solution is _______ . (acidic, basic, or neutral)
A 1.00L buffer solution is formed by adding 0.250 moles of KOH (aq) to 0.300 moles...
A 1.00L buffer solution is formed by adding 0.250 moles of KOH (aq) to 0.300 moles of HA. The Ka for HA = 3.1 x 10-5. A. What is the initial pH of the buffer? B. What will pH be after the addition of 0.0500 moles of H3O+? C. 10ml of a 3.5 M solution of NaOH are added to the buffer. What is the resulting pH?
Question 3 (1 point) A buffer solution is made by adding 15.0 mL of a 0.50...
Question 3 (1 point) A buffer solution is made by adding 15.0 mL of a 0.50 M Na2CO3 solution to 15.0 mL of a 0.50 M NaHCO3 solution in a test tube. 2.4 mL of a 1.0 M HCl solution is added to this buffer solution. What is the final pH of the solution in the test tube? H2CO3 has Ka1 = 4.3×10-7 and Ka2 = 5.6×10-11. Question 4 (1 point) A buffer solution is made by adding 10.0 mL...
A 1.0 L buffer solution contains 0.74 moles of ammonia 0.74 moles of ammonium chloride. Kb...
A 1.0 L buffer solution contains 0.74 moles of ammonia 0.74 moles of ammonium chloride. Kb = 1.8 x 10—5 . Calculate the pH of this buffer after the addition of 0.10 moles of NaOH.
8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH2PO4) and...
8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH2PO4) and 0.0100 moles of potassium hydrogen phosphate (K2HPO4) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? a) The pH of the solution will decrease by a large amount ( > 0.10 pH units) b) The pH of the solution will decrease by a small amount (< 0.10 pH units) c) The pH of the solution...
7) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH PO4)...
7) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH PO4) and 0.0100 moles of potassium hydrogen phosphate (K,HPO4) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? a) The pH of the solution will increase by a small amount (< 0.10 pH units) b) The pH of the solution will increase by a large amount (> 0.10 pH units) c) The pH of the solution...
8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH2PO4) and...
8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH2PO4) and 0.0100 moles of potassium hydrogen phosphate (K2HPO4) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? The pH of the solution will decrease by a large amount ( > 0.10 pH units) The pH of the solution will decrease by a small amount (< 0.10 pH units) The pH of the solution will be exactly...
urgent 8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH,PO)...
urgent
8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH,PO) and 6-0100 moles of potassium hydrogen phosphate (K_HPO.) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? a) The pH of the solution will decrease by a large amount (>0.10 pH units) b) The pH of the solution will decrease by a small amount (<0.10 pH units) c) The pH of the solution will be...
21) A buffer is prepared by adding 0.30 moles sodium acetate to 1.0L of a 0.45M...
21) A buffer is prepared by adding 0.30 moles sodium acetate to 1.0L of a 0.45M acetic acid solution what wou the pH of the buffer solution be? K = 1.8 x 10 pH = 4.5 pH = 4.7 + log 45 4.7+(-.18) SS
A 1.00 liter solution contains 0.45 M ammonia and 0.59 M ammonium perchlorate. If 0.150 moles...
A 1.00 liter solution contains 0.45 M ammonia and 0.59 M ammonium perchlorate. If 0.150 moles of calcium hydroxide are added to this system, indicate whether the following statements are TRUE or FALSE. (Assume that the volume does not change upon the addition of calcium hydroxide.) A. The number of moles of of NHz will decrease. (^_ B. The number of moles of of NH4+ will increase. A C. The equilibrium concentration of Hz0will decrease. ( D. The pH will...
8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH2PO4) and 0.0100 moles of potassium hydrogen phosphate (K2HPO4) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? a) The pH of the solution will decrease by a large amount ( > 0.10 pH units) b) The pH of the solution will decrease by a small amount (< 0.10 pH units) c) The pH of the solution...
7) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH PO4) and 0.0100 moles of potassium hydrogen phosphate (K,HPO4) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? a) The pH of the solution will increase by a small amount (< 0.10 pH units) b) The pH of the solution will increase by a large amount (> 0.10 pH units) c) The pH of the solution...
8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH2PO4) and 0.0100 moles of potassium hydrogen phosphate (K2HPO4) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? The pH of the solution will decrease by a large amount ( > 0.10 pH units) The pH of the solution will decrease by a small amount (< 0.10 pH units) The pH of the solution will be exactly...
urgent
8) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH,PO) and 6-0100 moles of potassium hydrogen phosphate (K_HPO.) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? a) The pH of the solution will decrease by a large amount (>0.10 pH units) b) The pH of the solution will decrease by a small amount (<0.10 pH units) c) The pH of the solution will be...
21) A buffer is prepared by adding 0.30 moles sodium acetate to 1.0L of a 0.45M acetic acid solution what wou the pH of the buffer solution be? K = 1.8 x 10 pH = 4.5 pH = 4.7 + log 45 4.7+(-.18) SS
A 1.00 liter solution contains 0.45 M ammonia and 0.59 M ammonium perchlorate. If 0.150 moles of calcium hydroxide are added to this system, indicate whether the following statements are TRUE or FALSE. (Assume that the volume does not change upon the addition of calcium hydroxide.) A. The number of moles of of NHz will decrease. (^_ B. The number of moles of of NH4+ will increase. A C. The equilibrium concentration of Hz0will decrease. ( D. The pH will...
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