Calculate the pH and % ionization of a 0.783 M NH3 solution. e. Another way to vaporize all of the liquid water at point F is to increase the pressure. of H2O = 2260 J/g), If 10.0 g of ice at −10.0°C is placed in 200. g of water at 80.0°C in an insulated container, what will be the temperature of the system when equilibrium is established? Explain how a buffer works. The K_b of NH_3 is 1.72 \times 10^{-5}. The dissociation constant K_a of HA is 5.66 \times 10^{-7}. The melting point of a solid is the same as the ____ of its liquid. What is the volume of a single unit cell? The p K a of H N O 2 is 3.998. The Kb of ammonia is 1.80 x 10-5. What is the heat of fusion of chromium (in kJ/mol) if 10.0 grams of solid chromium absorb 2.82 × 103 J of heat in melting at 2173 K, its melting point? Which one of the following statements is not applicable to covalent solids? (reverse or forward) CO3^2- + H2O = OH- + HCO3-, Which combination of an acid and a base can form a buffer solution? When equal molar amounts of the following sets of compounds are mixed in water, which will not form a buffer solution? (CH3)3N: ((CH3)3N) = 0.25 M, ((CH3)3NH+) = 4.3 * 10^-3 M, (OH-) = 4.3 * 10^-3 M, From the equilibrium concentrations given, calculate Ka for each of the weak acids and Kb for each of the weak bases. heat of H2O = 4.18 J/g•°C, Sp. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO_(3)^(-)). The Ka for HF is 3.5 x 10^-4. What is the pH of the resulting solution? Explain why the pH does not change significantly when a small amount of an acid or a base is added to a solution that contains equal amounts of the base NH_3 and a salt of its conjugate acid NH4Cl. The density of palladium is 12.0 g/cm3. Assume that the volume of the solutions are additive and that K a = 1.8... What is the [ H 3 O + ] for a buffer solution that is 0.2 M in acid and 0.5 M in the corresponding salt if the weak acid has a K a = 5.8 10 7 ? Ka(HNO2) = 4.5x10-4. Which one of the following statements does not describe the general properties of liquids accurately? Calculate the pH of a 1.7 times 10^{-2}. E) metallic solid. When x-rays with a wavelength of 0.8302Å are used, the second-order (n=2) Bragg reflection from a set of parallel planes in a niobium crystal is observed at an angle of θ = 14.57ο. Which one of the following statements does NOT describe the general properties of liquids accurately? Explain how a normal buffer system works. 2. Which picture below depicts the physical state present at 70K and 1.00atm? Ka for HCN is 4.9 x 10-10. (R = 0.0821 L • atm/(K • mol)). (Ka(HC2H3O2) = 1.8 x 10-5) a. What is the approximate pH of the solution? 1.5 \times 10^{-11} \\2. What is the main buffer system of human blood? For lactic acid, K a = 1.37 10 4 . A sketch of the phase diagram (not to scale) of water is given below. What is the pH of the following solution? heat of H2O(g) = 2.03 J/g•°C, heat of vap. A solution of 0.05 M acid (pKa = 6.10) mixed with an equal value of 0.1 M sodium solution of sodium salt. A table of pKa values 4.82. Which of these compounds would be the best buffer at pH 5. E. Most solids have high vapor pressures at room temperature. a. HF and NaF b. HF and NH3 c. HF and NaNO2 d. HNO3 and NaNO3. a) Hypobromous acid b) Sodium bisulfite c) Ascorbic acid d) Formi... Ammonia (NH_3) ionizes according to the following reaction: NH_3(aq) + H_2O(l) to NH_4^+ (aq) + OH^- (aq) The base dissociation constant for ammonia (NH_3) is K_b = 1.8 times 10^{-5}. A 0.399 M solution of a base (BOH) has a pH of 10.74. A buffer solution is 0.344 M in KHSO3 and 0.271 M inK2SO3. (Sp. MSG behaves as a buffer. It bonds with the added H^+ or OH^- in solution. Which response includes all of the following compounds that exhibit hydrogen bonding and no other compounds? What is the pH after 0.036 mol of HCl is added to 0.72 L of the solution?