The dissociation of water into H_3O^+ and OH^- ions depends on temperature. At 0

Question

The dissociation of water into H_3O^+ and OH^- ions depends on temperature. At 0 degree C the [H_3O^+] = 3.38 times 10^-5 M, at 25 degree C the [H_3O^+) = 1.00 times 10^-7 M, and at 50 degree C the [H_3O^+] = 2.34 times 10^-7 M. At what temperature water is acidic? 1. 0 degree C b. 25 degree C c. 50 degree C d. 15 degree C Solubility of NaCI in water in 35.8 g/I00 mL of water at 20 degree C. Which one of the following solutions is saturated? a. 35.8 g NaCI/200 mL water b. 50.0 g NaCI/200 mL water c. 20.0 g NaCI/75 mL water d. 53.7 gNaCI/150 mL water An isotonic solution contains 0.15 M NaCI. Which one of the following CaCI_2 solutions will be isotonic to the 0.15 M NaCI solution? a. 0.15 M CaCI_2 b. 0.10 M CaCI_2 c. 0.05 M CaCI_2 d. 0.45 M CaCI_2 When red blood cells are placed in an hypotonic solution, a. water flows out of the red blood cells. b. water flows inside the red blood cells. c. there is no net flow of water. d. the cells stay normal. Which solution will have the largest freezing point depression of water? a. 1.0 M CaCI_2 b. 1.5 M NaCI c. 1.0 M AICI_3 d. 3.5 M Glucose Which compound is copper (II) chloride dihydrate? a. CuCI middot 2 H_2O b. CuSO_4 middot 2 H_2 O c. CuCL_2 middot 2 H_2 O d. CaCI_2 middot 2 H_2 O Decane is non-polar liquid and has density of 0.730 g/mL Water has a density of 1.00 g/mL 5 mL of each of decane and water transferred to a glass test tube at room temperature. Now 5 mL of saturated iodine-water solution, which has a strong purple color, is added to the test tube. The test tube is gently shaken and then kept in a test tube rake. Which one of the following observations will hold true? a. The two liquids are immiscible and lower portion of liquid in the test tube will have a strong purple color. b. The two liquids are immiscible and upper portion of liquid in the test tube will have a strong purple color. c. The two liquids are miscible and liquid in the test tube will have a uniform color throughout. d. Decane, water and iodine will form three layers.

Explanation / Answer

Q34

in order for a species to be acidic:

pH < 7

from the temperatures shown we need [H+] > 10^-7

the only sample is

[H3O+] = 2.34*10^-7 at 50°C

pH = -log(2.34*10^-7 ) = 6.63

choose T = 50°C

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