Homework Answers
27. Calculate the pH of a mixture made by adding 50.0 mL of 0.20 M HCI(aq)...
27. Calculate the pH of a mixture made by adding 50.0 mL of 0.20 M HCI(aq) to 150.0 mL of water at 25.0°C A) 0.70 B) 1.00 C) 1.18 D) 1.30 E) 13.0 Ans: D 28. A mixture is made by adding 50.0 mL of 0.20 M NaOH(aq) to 50.0 mL of water. At 25.0°C, what is its pH? A) 1.00 B) 4.55 C) 7.00 D) 13.0 E) 13.3
Q(38) What is the pH of a 0.0200 M aqueous solution of HF (K. of HF...
Q(38) What is the pH of a 0.0200 M aqueous solution of HF (K. of HF is 6.8 A) pH=14 B) pH=2.4 C) pH 47 D) pH=9,3 10 ) E) pH=12,6 Q(39) What is the pH of a 0.1 M aqueous solution of NH3 (Ko of HF is 1.8 * 10-5)? A) pH=14 B) pH=2.4 C) pH 6.7 D) pH=11.3 6) pH=12.6 Q(40) Aqueous metal ions behave as Lewis acids because they A) can readily accept electrons in their vacant...
A 25.0 mL volume of 0.0200 M Fe(NO3)3 is mixed with 50.0 mL of 0.00200 M...
A 25.0 mL volume of 0.0200 M Fe(NO3)3 is mixed with 50.0 mL of 0.00200 M NaSCN and 25.0 mL of 0.100 HNO3. The blood-red FeSCN2+ ion forms and the equilibrium is established: Fe3+(aq) + SCN-(aq) <---> FeSCN2+(aq) The equilibrium concentration of FeSCN2+ ([FeSCN2+]) was measured spectrophotometrically and found to be 7.0 x 10-4 mol/L. To calculate the equilibrium constant (Kc) for thr equilibrium system, proceed through the following steps: A. Moles of Fe3+, initial B. Moles of SCN-, initial...
23) What is the pH of a solution prepared by mixing:
23) What is the pH of a solution prepared by mixing: 0.20 moles of acetic acid 0.40 moles of sodium acetate 0.10 moles of sodium hydroxide in 1.0 L of solution a) 4.74 b) 4.14 5.34 d) 13.00 e) None of the above 24) Barbituric acid (Ka = 9.8 X 10-5) is titrated with 0.200 M NaOH. What is the initial pH of 20.0 mL of 0.100 barbituric acida) 2.50 b) 4.01 c) 8.35 d) 7.00 e) None of the above 25) What is the pH in...
6. What is the pH of a 2.75 x 10-6 M solution of HCI? 5.56 5.54...
6. What is the pH of a 2.75 x 10-6 M solution of HCI? 5.56 5.54 4.85 3.26 7. Consider the complexation reactions below: Zn2++C2O Zn2++2 C2022 ZnC20 Zn(C204)22 K1= 7.1 x 10 B1 4.0 x 107 If you mix 0.025 M Zn(NO3) with 0.030 M Na,C,O4, what is the mass balance C2O,2-? O 2IZN*] = 2 (C,0,2-1+2 [Zn(C,0,)2 0.030 = [C20,2- + [Zn(C204)] + [Zn (C,O4)22- [C20,2-1+Zn(C20,)] + 2 [Zn(C204)22-] 0.030 O None of the above. 8. Butanoic acid...
1.What is the mole fraction of MgCl2 (MM=95.21 g/mole) in an aqueous solution that is 5.80...
1.What is the mole fraction of MgCl2 (MM=95.21 g/mole) in an aqueous solution that is 5.80 m MgCl2? A. 0.104 B. 0.0946 C. 0.356 D. 0.553 E. none of these 2. A solution contains 0.144m Na2SO4 and has a measured freezing point of -0.606 degree celcius. What is the value of the Van’t Hoff factor, i? The freezing point depression constant for water is -1.86 degree celcius/m. A. 3 B.0.326 C.2.26 D. 3.07. E. Cannot be determined 3.The vapor pressure...
If the pk, of CH NH, is 3.38, what is the phl of 0.70 M solution...
If the pk, of CH NH, is 3.38, what is the phl of 0.70 M solution of CHANH.CH a. b. c. d. e. 5.39 4.67 7.00 8.61 4.11 N t her to be an entropy decrease in the system in which of the following processes might o a. CaCl (s)-> Cal(aq) + 2Cl(aq) b. HO(1) -> H2O(g) e. Fe(s) at 200 K --Fe(s) at 300 K d. N:0.(g) - 2NO, (g) e. 1xg) - 1:(s) 19. When HCl is added...
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b...
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b only C) c only D) bandc E) a and 33) The value of AH' for the reaction below is - 790 kl. The enthalpy change accompanying the reaction of 0.95 g of Sis_ k 33) 25 (s) + 302 (9) -2503 (9) A) 12 B) 23 C) -23 D) - 790 E) -12 34) The value of AH' for the...
Question 71. If 25.0 mL of 0.150 M aluminum bromide reacts with 15.0 mL of 0.200 M silver nitrate, what mass of silv...
Question 71. If 25.0 mL of 0.150 M aluminum bromide reacts with 15.0 mL of 0.200 M silver nitrate, what mass of silver bromide is produced? AgBr ()+ AI(NO3)3 (aq) AIBr3 (aq)+AgNO3 (aq) a) 2.11 x 104 g b) 2.11 g c) 5.63 x 104 g d) 0.563 g e) none of the above Question 72 What is the molarity of aluminum ions in the above question before the reaction has taken place? a) 0.150 M A13 b) 0.350 M...
a.Determine the pH of a 0.20 M CH3NH3Cl solution. (Kb (CH3NH2) = 4.4 x 10-4)...
a.Determine the pH of a 0.20 M CH3NH3Cl solution. (Kb (CH3NH2) = 4.4 x 10-4) b. Determine what products are expected to be produced (a) at the cathode and (b) at the anode as a result of electrolysis of an aqueous solution of MgI2 with inert electrodes. The standard electrode potentials are: O2(g) + 4 H+(aq) + 4 e-→ 2 H2O(l) E° = +1.23 V I2(s) + 2 e- → 2 I-(aq) E° = +0.54 V 2 H2O(l) + 2 e-...
27. Calculate the pH of a mixture made by adding 50.0 mL of 0.20 M HCI(aq) to 150.0 mL of water at 25.0°C A) 0.70 B) 1.00 C) 1.18 D) 1.30 E) 13.0 Ans: D 28. A mixture is made by adding 50.0 mL of 0.20 M NaOH(aq) to 50.0 mL of water. At 25.0°C, what is its pH? A) 1.00 B) 4.55 C) 7.00 D) 13.0 E) 13.3
Q(38) What is the pH of a 0.0200 M aqueous solution of HF (K. of HF is 6.8 A) pH=14 B) pH=2.4 C) pH 47 D) pH=9,3 10 ) E) pH=12,6 Q(39) What is the pH of a 0.1 M aqueous solution of NH3 (Ko of HF is 1.8 * 10-5)? A) pH=14 B) pH=2.4 C) pH 6.7 D) pH=11.3 6) pH=12.6 Q(40) Aqueous metal ions behave as Lewis acids because they A) can readily accept electrons in their vacant...
6. What is the pH of a 2.75 x 10-6 M solution of HCI? 5.56 5.54 4.85 3.26 7. Consider the complexation reactions below: Zn2++C2O Zn2++2 C2022 ZnC20 Zn(C204)22 K1= 7.1 x 10 B1 4.0 x 107 If you mix 0.025 M Zn(NO3) with 0.030 M Na,C,O4, what is the mass balance C2O,2-? O 2IZN*] = 2 (C,0,2-1+2 [Zn(C,0,)2 0.030 = [C20,2- + [Zn(C204)] + [Zn (C,O4)22- [C20,2-1+Zn(C20,)] + 2 [Zn(C204)22-] 0.030 O None of the above. 8. Butanoic acid...
If the pk, of CH NH, is 3.38, what is the phl of 0.70 M solution of CHANH.CH a. b. c. d. e. 5.39 4.67 7.00 8.61 4.11 N t her to be an entropy decrease in the system in which of the following processes might o a. CaCl (s)-> Cal(aq) + 2Cl(aq) b. HO(1) -> H2O(g) e. Fe(s) at 200 K --Fe(s) at 300 K d. N:0.(g) - 2NO, (g) e. 1xg) - 1:(s) 19. When HCl is added...
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b only C) c only D) bandc E) a and 33) The value of AH' for the reaction below is - 790 kl. The enthalpy change accompanying the reaction of 0.95 g of Sis_ k 33) 25 (s) + 302 (9) -2503 (9) A) 12 B) 23 C) -23 D) - 790 E) -12 34) The value of AH' for the...
Question 71. If 25.0 mL of 0.150 M aluminum bromide reacts with 15.0 mL of 0.200 M silver nitrate, what mass of silver bromide is produced? AgBr ()+ AI(NO3)3 (aq) AIBr3 (aq)+AgNO3 (aq) a) 2.11 x 104 g b) 2.11 g c) 5.63 x 104 g d) 0.563 g e) none of the above Question 72 What is the molarity of aluminum ions in the above question before the reaction has taken place? a) 0.150 M A13 b) 0.350 M...
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