Textbook Question
(a) Write the net ionic equation for the reaction that occurs when a solution of hydrochloric acid (HCl) is mixed with a solution of sodium formate 1NaCHO22.
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Ch.17 - Additional Aspects of Aqueous Equilibria
Chapter 17, Problem 112
A sample of 7.5 L of NH3 gas at 22 _x001F_C and 735 torr is bubbled into a 0.50-L solution of 0.40 M HCl. Assuming that all the NH3 dissolves and that the volume of the solution remains 0.50 L, calculate the pH of the resulting solution.
Verified step by step guidance1
Step 1: Convert the temperature from Celsius to Kelvin by adding 273.15 to the Celsius temperature. This will be used in the ideal gas law calculation.
Step 2: Use the ideal gas law, PV = nRT, to calculate the number of moles of NH3 gas. Convert the pressure from torr to atm by dividing by 760, and use the volume in liters, the temperature in Kelvin, and R = 0.0821 L·atm/mol·K.
Step 3: Calculate the initial moles of HCl in the solution using the concentration (0.40 M) and the volume of the solution (0.50 L).
Step 4: Determine the limiting reactant by comparing the moles of NH3 and HCl. NH3 reacts with HCl in a 1:1 molar ratio to form NH4Cl.
Step 5: Calculate the concentration of NH4+ in the solution after the reaction. Use this concentration to find the pH by considering the hydrolysis of NH4+ and using the expression for the equilibrium constant, Kb, of NH3.
Related Practice
Textbook Question
(a) A 0.1044-g sample of an unknown monoprotic acid requires 22.10 mL of 0.0500 M NaOH to reach the end point. What is the molar mass of the unknown?
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Textbook Question
(b) As the acid is titrated, the pH of the solution after the addition of 11.05 mL of the base is 4.89. What is the Ka for the acid?
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Textbook Question
What is the pH at 25 C of water saturated with CO2 at a partial pressure of 1.10 atm? The Henry's law constant for CO2 at 25 C is 3.1 * 10-2 mol>L@atm.
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Open Question
Excess Ca(OH)₂ is shaken with water to produce a saturated solution. The solution is filtered, and a 50.00-mL sample is titrated with HCl, requiring 11.23 mL of 0.0983 M HCl to reach the endpoint. Calculate Ksp for Ca(OH)₂. Compare your result with that in Appendix D. Suggest a reason for any differences you find between your value and the one in Appendix D.
Textbook Question
The osmotic pressure of a saturated solution of strontium sulfate at 25 C is 21 torr. What is the solubility product of this salt at 25 C?
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