8.7 pH and Solubility

• A pH less than 7 indicates an acidic solution.


  True
• A pH of 7 indicates a neutral solution where [H+] is equal to [OH-]
• The pH of a solution can be calculated using the formula pH = -log[H+]
• What is the definition of solubility?

  Ability to dissolve
• Match the pH condition with its effect on solubility:

  Acidic (pH < 7) ↔️ Basic salts dissolve more

  Basic (pH > 7) ↔️ Acidic salts dissolve more
• What pH value indicates a neutral solution?

  7
• The pH is defined as the negative base-10 logarithm of [H+].
• What type of compounds are most affected by pH changes in terms of solubility?

  Ionic compounds
• What is the pH of a solution with [H+] = 1.0 x 10^-3 mol/L?

  3
• The pH is defined as the negative base-10 logarithm of the hydrogen ion concentration
• What is the pH range of the pH scale?

  0 to 14
• What is the relationship between pH and hydrogen ion concentration [H+]?

  Inverse
• If [H+] = 0.001 M, the pH is 3.


  True
• The solubility of gases increases with pressure according to Henry's Law.


  True
• The solubility product constant (Ksp) remains constant for a given temperature.
• Values below 7 on the pH scale signify acidic solutions.


  True
• Match the factor with its effect on solubility:

  Temperature ↔️ Generally increases solubility

  Pressure ↔️ Primarily affects gases

  Polarity ↔️ Like dissolves like

  pH ↔️ Impacts ionic compounds
• In acidic conditions, the solubility of calcium carbonate (CaCO3) increases because H+ reacts with CO3^2-.
• What does pH measure?

  Acidity or basicity
• Match the solution type with its pH range:

  Acidic ↔️ < 7

  Neutral ↔️ 7

  Basic ↔️ > 7
• Basic solutions have a pH greater than 7.


  True
• Solubility generally increases as temperature increases.
• Why do hydroxide ions (OH-) reduce in acidic solutions?

  Neutralized by H+
• The pH scale ranges from 0 to 14.
• As [H+] increases, the pH decreases, indicating a more acidic solution.


  True
• The solubility product constant (Ksp) changes with temperature.


  True
• In basic solutions, the solubility of calcium oxalate (CaC2O4) increases because excess OH- reacts with H+.