HW 14 <Question 24 (of 29) 0.68 points 10 attempts left Check my work Enter your answer in the provided box. In a dilute nitric acid solution, Fe' reacts with thiocyanate ion (SCN) to form...
In a dilute nitric acid solution, Fe3+ reacts with thiocyanate ion (SCN−) to form a dark red complex: [Fe(H2O)6]3+ + SCN− ⇌ H2O + [Fe(H2O)5NCS]2+ The equilibrium concentration of [Fe(H2O)5NCS]2+ may be determined by how dark the colored solution is (measured by a spectrometer). In one such experiment, 1.0 mL of 0.20 M Fe(NO3)3 was mixed with 1.0 mL of 9.2 ×10−3M KSCN and 8.0 mL of dilute HNO3. The color of the solution quantitively indicated that the [Fe(H2O)5NCS]2+ concentration was...
5.00 points 5 atempts let Check my work Enter your answer in the provided box. A quantity of 2.30 x 102 mL of 0.650 M HNO, is mixed with 2.30 x 10 mL of 0.325 M Ba(OH), in a constant-pressure calorimeter of negligible heat capacity. The initial temperature of both solutions is the same at 18.46°C. The heat of neutralization when 1.00 mol of HNOj reacts with 0.500 mol Ba(OH) is-56.2 kJ/mol. Assume that the densities and specific heats of...
value 1.00 points 1 attempts left Check my work Enter your answer in the provided box. A buffer solution is prepared in such a way that the concentration of propanoic acid is 1.92 x 10 Mand the concentration of sodium propanoate is 1.51 x 10° M. If the buffer equilibrium is described by CH3COOH(aq) + H20(1) = H2O*(aq) + CH3C00 (aq) Gul propanoic acid propanoate ion with K = 1.34 x 105 calculate the pH of the solution. pH =...
Question 11 of 15) value 1.00 points 3 attempts left Check my work Enter your answer in the provided box. solution of NaOH. Calculate the pH of a 1.0 x 10M pH= Question 14 (of 15) value: 1.00 points 3 attempts left Check my work Enter your answer in the provided box. Calculate the pH of a solution with a H2O concentration of: 1.8 x 10-6 M
.95 points 14 attempts left Check my work Enter your answer in the provided box. How many milliliters of 1.45 M NaOH must be added to 175 mL of 0.11 M NaH,PO4 to make a buffer solution with a pH of 7.00? 8.21