Magnesium chloride (MgCl_2) and ethanol (CH_CH_OH) When potassium chloride KCl,

Question

Magnesium chloride (MgCl_2) and ethanol (CH_CH_OH) When potassium chloride KCl, dissolves in water. Which of these diagrams would best represent what you would expect to find in solution? Which is a precipitation reaction? 2Cr + 6HNO_3 (aq) rightarrow 2Cr(NO_3)_3 (aq) + 3H_2 H_3PO_4 (aq) + 3KOH(aq) rightarrow K_3PO_4 (aq) + 3H_2O 3Ba(NO_3)_2 (aq) + 2Na_3PO_4 (aq) rightarrow Ba_3(PO_4)_2 + 6NaNO_3 (aq) NaHCO_3 (aq) + HCl (aq) rightarrow NaCl (aq) + CO_2 + H_2O What is the net ionic equation for the reaction of aqueous solutions of Pb(NO_3)_2 and KCl? Pb^2+ (aq) + Cl^- (aq) rightarrow PbCl_2 Pb^2+ (aq) + 2Cl^- (aq) rightarrow PbCl_2 Pb(NO_3)_2 (aq) + 2KCl (aq) rightarrow 2KNO_3 (aq) + PbCl_2 2K^+ (aq) + 2Cl^- (aq) + Pb^2+ (aq) + 2NO^-_3 (aq) rightarrow 2K^+ (aq) + 2NO^-_3(aq) + PbCl_2 NH_2 acts as base. NH^-_3 is the conjugated acid of NH_3 Which is a conjugate acid base pair in the reaction N_H_(aq) + H_2O(l) N_H_(aq) + OH(aq) N_H_and H_2O N_H^-_and N_H_and N_H_N_H_and The pH of four different solutions was determine then small amounts of strong acid (0.01 mol) to equal volumes of each. From these measurements, we can conclude any acid was added solutions 1 and 3 are buffers but greater buffer capacity than 1. solutions 2 and 4 are buffers but greater buffer capacity than 4. solutions 3 and 4 are buffers but greater buffer capacity than 3. none of the four initial solutions is a b Equal volumes of solutions of acids and the salts are mixed to prepare a buffer. The closest to 5.0 was prepared by mixing 1.0 times 10^-5 M hydrochloric acid and 0.1 0.10 M benzoic acid (K_a = 6.3 times 10^-5) sodium benzoate 0.10 M butyric acid (K_a = 1.5 times 10^-5) sodium butyrate 0.10 M formic acid (K_a = 4.3 times 10^-4) sodium formate

Explanation / Answer

26) A

27) In precipitation reaction, solid product will be formed.

Therefore, ans = c

28) B

  In this raection, PbCl2 (s) will be formed from Pb2+ and 2Cl- but not Pb2+ , Cl-.

Therefore, ans = B

30) conjugate acid-base pairs:

   N2H4 and N2H5+

   H2O and OH-

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