When 100 mL 0.2 M malonic acid (HOOC-CH_2-COOH, abbreviated H_2A), is titrated w

Question

When 100 mL 0.2 M malonic acid (HOOC-CH_2-COOH, abbreviated H_2A), is titrated with 0.2 M of NaOH solution, which of the following statements is correct? a. pH at the second equivalence point = pK_. b. The number of moles of malonic acid is equal to the number of moles of NaOH is requires to reach the second equivalence point. c. The normality of malonic acid is 0.4 N. d. pH at the first equivalence point = pK_. What is expected for the freezing point of a solvent when a solute is added to the pure solvent? a. A phase change b. No change c. An increase d. A decrease Which of the following is the correct expression for K of the ionization of chromic acid in water? H_2CrO_ rightarrow 2H^- + CrO_4^3. a. [2H^+] [CrO_4^2-]/[H_2CrO_4] b. [H_2CrO_4]/[H^+]^4 [CrO_4^2-]^4 c. [H^+]^2[CrO_4^2-]/[H_2CrO_4] d. [H_2 CrO_4][2H^+] Which of the following are correct? Chemical waste from your experiment may be washed down the sink if plenty of water is added the waste. You must wear splash-proof goggles in lab when anyone is doing chemical experiments in Open-toed shoes and sandals can be worn in the lab if you are taking a summer lab class. Eating, drinking, or smoking are not allowed in the laboratory. a. 2, 3, and 4 b. 2 and 4 c. 1, 2, and 3 d. 1 only e. 2 only

Explanation / Answer

ANSWER

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11 option [c] is correct because normality =molarityx eqivalent here malonic acid have two eqivalent so normality of

malonic acid =0.2 x2=0.4

12 option [d] is correct..freezing point is coligative property when add solute decrese it.

13 option [c] is correct ..because no.of cation take place as exponent.

14 option [b] is correct

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