The pH of the solution with dissolved salts is to be predicted. Concept introduction: Salt is a strong electrolyte that dissociates completely when added to water. When a salt contains a cation that comes from a weak base then the cation recombines with water to produce a weak base and hydronium ions, and forms an acidic solution. When a salt contains an anion that comes from a weak acid then the anion recombines with water to produce a weak acid and hydroxide ions, and forms a basic solution. The anion, if it comes from a strong acid, does not recombine and is present in the solution as a free ion without having any effect on the pH of the solution. The cations that are highly charged and have a small size will form acidic solutions. The cations from group 1A and selective cations of group 2A, along with the ones from strong bases will form a neutral solution.
The pH of the solution with dissolved salts is to be predicted. Concept introduction: Salt is a strong electrolyte that dissociates completely when added to water. When a salt contains a cation that comes from a weak base then the cation recombines with water to produce a weak base and hydronium ions, and forms an acidic solution. When a salt contains an anion that comes from a weak acid then the anion recombines with water to produce a weak acid and hydroxide ions, and forms a basic solution. The anion, if it comes from a strong acid, does not recombine and is present in the solution as a free ion without having any effect on the pH of the solution. The cations that are highly charged and have a small size will form acidic solutions. The cations from group 1A and selective cations of group 2A, along with the ones from strong bases will form a neutral solution.
Solution Summary: The author explains that the pH of the solution with dissolved salts is to be predicted.
The pH of the solution with dissolved salts is to be predicted.
Concept introduction:
Salt is a strong electrolyte that dissociates completely when added to water.
When a salt contains a cation that comes from a weak base then the cation recombines with water to produce a weak base and hydronium ions, and forms an acidic solution.
When a salt contains an anion that comes from a weak acid then the anion recombines with water to produce a weak acid and hydroxide ions, and forms a basic solution.
The anion, if it comes from a strong acid, does not recombine and is present in the solution as a free ion without having any effect on the pH of the solution.
The cations that are highly charged and have a small size will form acidic solutions.
The cations from group 1A and selective cations of group 2A, along with the ones from strong bases will form a neutral solution.
Propionic acid, HC3H5O2, has Ka= 1.34 x 10–5.
(a) What is the molar concentration of H3O+ in 0.15 M HC3H5O2 and the pH of the solution?
(b) What is the Kb value for the propionate ion, C3H5O2–?
(c) Calculate the pH of 0.15 M solution of sodium propionate, NaC3H5O2.
(d) Calculate the pH of solution that contains 0.12 M HC3H5O2 and 0.25 M NaC3H5O2.
The major component of vinegar is acetic acid, CH3COOH. Its Ka is 1.8 × 10-5 . One student used 1.000 M NaOH to titrate 25.00 mL vinegar. At the end point, 21.82 mL NaOH was used.
(a) What is the concentration of CH3COOH in vinegar?
(b) What is the pH of the solution at the end point?
(c) What indicator(s) the student should use in this titration? Explain
Determine whether aqueous solutions of the following salts have a pH equal to, greater than, or less than 7; if pH > 7 or pH< 7, write a chemical equation to justify your answer. (a) NH4Br. (b) Na2CO3, (c) KF, (d) KBr, (e) AICI3, (f) Co(NO3)2.
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