
Which of the following would form a buffer if added to a solution of SnF2? a....
11a) 1.00 moles of lactic acid (HC3H5O3, Ka = 1.4 x 10-4) and 1.00 moles of sodium lactate (NaC3H5O3) are dissolved in water resulting in a solution with a final volume of 550 mL. What is the pH of the solution after the addition of 0.080 moles of HCI? a. 0.80 b. 1.8 C. 2.8 d. 3.8
11a) 1.00 moles of lactic acid (HC2H5O3, Ka - 1.4 x 104) and 1.00 moles of sodium lactate (NaC3H5O3) are dissolved in water resulting in a solution with a final volume of 550 mL. What is the pH of the solution after the addition of 0.080 moles of HCI? a. 0.80 b. 1.8 c. 2.8 d. 3.8 0 0 0 ΓΝ 5 nts 12a) Metacresol is a pH indicator which changes from yellow to purple at pH = 8.2. Which...
A buffer is made by adding 0.120 mol of lactic acid, (CH3COHCOOH - monoprotic), HC3H5O3, and 0.100 mol of sodium lactate, NaC3H5O3 to enough water to make 1.00 L of solution. The pH of the buffer was calculated in question # 6. A) Calculate the pH of the solution after 0.001 mol of NaOH is added. Ka (lactic acid) = 1.4 x 10-4. Assume no volume change. B) Calculate the change in pH if 0.001 mol of NaOH is added...
D Question 4 5 pts 2b) There are 0.10 moles of N2O4 and 0.20 moles of NO 2 present in a 2.0 L container which may react according to: N2O4(g) = 2N028) Kp = 11 What is the value of Qp for the initial gas mixture? a. 4.0 b. 0.20 c. 0.40 d.5.0 . a. b. Consider the following equilibrium systems. Which direction will the reactions shift (reactants or products) when cooled? 200g + O2(g) = 2CO2(g) H2e+12(e)=2HI® H2(g) +126)...
A buffer solution is made such that the initial concentrations of lactic acid (HC3H5O3) and the lactate ion (C3H5O3-) are both 0.600 M. What is the resulting pH if 10.0 mL of 1.00 M HCL is added to 0.500 of the buffer solution? (ka of HC3H5O3= 1.4 x 10^-4)
1. Which of the following make a buffer solution? (circle all the correct answers) a. 0.1 M HCl and 0.1 M NaCl b. 0.1 M HF and 0.075 M KF C. 0.15 M Pentanoic acid and 0.15 M sodium pentanoate d. 0.1 M NaOH and 0.1 M HCI e. 0.1 M acetic acid and 0.00001 sodium acetate 2. Which of the following could make buffer systems when mixed together? (circle the correct answers) a. 0.10 M acetic acid and 0.05...
Exam review questions
2) In which aqueous system is PbF2 least soluble? 2) A) 1.0 M HNO3 B) H20 C) 0.5 M HF D) 0.2 MHF E) 0.8 M KF 3) A buffer solution contains 0.100 M fluoride ions and 0.126 M hydrogen fluoride. What is the 3) concentration (M) of hydrogen fluoride after addition of 7.00 mL. of 0.0100 M HCI to 25.0 mL of this C0.123 4) In which of the following aqueous solutions would you expect AgCl...
3a. Calculate the pH of a 7.8x10 * M HCl solution. 3b. Is this solution acidic, basic or neutral? 4a. Determine the pH of 1.3 x 10 M NaOH. 4b. Is this solution acidic, basic or neutral? 5a. A 0.1 M NaHCO3 solution has a pH of 8.400. What is the [H3O'? 5b. Is this solution acidic, basic or neutral? 6. Determine whether the following statements are true or false regarding a 0,010 M solution of the strong acid HNO3:...
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?
You need to make a buffer solution with pH of 8.0. You have the following reagents on your shelf: HC3H5O3 Ka=1.4*10-4 NaF HF Ka=6.6*10-4 Tris-base HC2H3O2 Ka=1.8*10-5 NH3 HClO Ka=2.9*10-8 NaC2H3O2 Tris-HCl Ka=8.3*10-9 NaClO NH4Cl Ka=5.6*10-10 NaC3H5O3 a) Which reagents would you use to make the buffer solution. Briefly explain why you would choose these. b) In what ration of molar concentrations would you combine them?