1- In the Group 2 precipitations, the Sulfide Ion (S) is generated in an Acidic environment. If the H;S concentration is maintained at 0.1M and the pH 1013 for H,S.). = 1, what is the [S] concentration? (K1 = 1 x 107 and Kn i %3D
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- 5. What concentration of acetate ion (CH3CO2') in 0.500 M CH3CO2H produces a buffer solution with pH = 5.00? (Ka = 1.8 x 10-5) CH;CO2H (aq) H20 (I) CH;CO, (aq) H30* (aq) + 6. A buffer solution is formed by adding 0.500 mol of sodium acetate (CH3CO2NA) and 0.500 mol of acetic acid (CH;CO2H) to 1.00LH,0. What is the pH of the solution at equilibrium? (K, 1.8 x 10°)1- In the Group 2 precipitations, the Sulfide Ion (S) is generated in an Acidic environment. If the H2S concentration is maintained at 0.1M and the pH = 1, what is the [S] concentration? (Ka1 1013 for H;S.). 1 x 10 and K22 = 1 x %3D %3! %3DFor the reaction of hydrazine (N2H4) in water, H,NNH, (ag) + H20(1) = H,NNH,+(aq) + OH¯(@ag) K, is 3.0 x 10-. Calculate the concentrations of all species and the pH of a 1.6-M solution of hydrazine in water. [H,NNH,] =| %3D [H,NNH, !3! JOH |= %3D [H*]=[ ]M pH= %3D
- A buffer solution was prepared by dissolving 0.04 mol Na2HPO4(s) and 0.02 molNaH2PO4(s) in water and diluted to a total volume of 1.0 L. 1 What will be the concentration of the buffer? Report your calculations.2 Calculate the pH of the buffer solution. (K =5*10 ). Report your calculations3 How does the pH in the buffer change when 1 mmol NaOH is added? Report your calculations.The solubility of magnesium hydroxide in pure water is 1.3 x 10–4 mol/L. (a) Calculate the Ksp of Mg(OH)2; (b) What isthe pH of saturated Mg(OH)2solution at 25oC? (c) Calculate the solubility of Mg(OH)2 in a solution buffered at pH 9.0?What weight of potassium hydrogen phthalate will require 30. mL of a 0.30M NaOH solution to reach the equivalence point? KHP MM 204.22 g/mol .CO;K' .CO;K' NaOH + H2O + *CO,H COƠ,Na'
- From the following choose the most appropriate weak base (when added to its conjugate acid) for making a buffer with pH = 4.50 O (CH3)3N (K, = 6.4 x 105) %3D O CgH5NH2 (K = 3.9 x 1010) O C2H5NH2 (Kg = 5.6 x 104) O HONH2 (K, = 1.1x 108) %3D O NH3 (K5 - 1.8 x 10 5)One strategy for dealing with the acidification of lakes is periodically to add powered limestone (CaCO3) to them, resulting in pH of 10.95. Calculate the Ca2+ concentration in the lake. CO2 in atmosphere 370 ppm KH,CO2 = 0.033 mol/(L∙atm) Ka1 = 10-6.3 Ka2 = 10-10.3 Ksp,CaCO3 = 4.57 x 10-9Tungsten trioxide (Wo,) has a rich yellow color and is often used as a pigment in ceramics and paints. To test a ceramic vase for its WO, content, a 10.11 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO, to W+. The resulting w* was transferred to 500.0 mL. of 1.00 M HCI. A 100.00 ml. aliquot of the HCl solution required 13.18 mL of 0.08251 M I 1.00M potassium permanganate (KMNO,) to reach the purple endpoint. A blank required 0.15 ml.. Balance the redox reaction. redox reaction: Mno; + w* Mn* + wo?* Determine the percent Wo, in the ceramic sample. percent WO,:
- 1. Calculate the concentration of ions in the following saturated solutions: (a) [1'] in Agl solution with [Ag'] = 9.1 x 10° M; Ksp= 8.3 x 107 (b) [A*] in Al(OH); solution with [OH] = 2.9 x 10° M; Ksp = 1.8 x 10 33 2. 2.4414 g sample containing KCI, K;SO4 and inert materials was dissolved in sufficient water to give 250 mL of solution. A Mohr titration of a 50 ml aliquot required 41.36 ml of 0.05818 M AGNO3. A second 50mL aliquot was treated with 40 ml of 0.1083M NaB(CsHs)4. The reaction is NaB(CsHs)a + + KB(CsHs)4s) + Na*. The solid was filtered, redissolved in acetone, and titrated with K* 49.98mL of the AgNO: solution according to the reaction KB(C,H;). + Ag* + AgB(CsHs)46) + K*. Calculate the percentage of KCl and K:SO, in the sample. a. As a food chemist for a major potato chip company, you are responsible for determining the salt content of new potato chip products for the packaging label. The potato chips are seasoned with table salt, NaCl. You weigh out a handful of the chips…3.A sample is known to contain NaOH, Na2CO3 NaHCO3 or compatible mixture of these together with inert matter. With methyl orange, a 1.100 g sample requires 31.40 mL of HCl ( 1.00 mL is equivalent to 0.0140g CaO). With phenolphthalein indicator, the same weight of sample requires 13.30mL of the acid. What is the percent composition of the sample? ww wwA buffer solution is prepared from a generic weak acid "HG" and the salt KG. The K, for HG is 3.7 x 10. What is the correct equation for the dominant equilibrium in the buffer solution? O KG + HG HKG' + G O KG + H,O KOH- + HG O HG + H,O OH- + H2G O HG + H,O G + H2O* G+ H20 OH + HG