Chemistry Exam - SEC 3
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Questions and Answers

Which of the solution has pH above 7?

  • 0.3M KCN (correct)
  • 1.2M CH3COOH
  • 0.2M HCN
  • 1.5 M NH4Cl

Which of the following shows the type of NaH2PO4 solution and it is PH?

  • Acidic, PH is below 7 (correct)
  • Neutral, PH equals 7
  • Basic, PH is above 7
  • Basic, PH is below 7

On mixing two equal volumes of nitric acid and potassium hydroxide solution, both of 0.25 M, a solution is formed which is ----------

  • Acidic
  • Amphoteric
  • Alkaline
  • Neutral (correct)

NH4NO2 solution is acidic inspite of being produced from neutralization of a weak acid with a weak base, as.....

<p>Ka &gt; Kb (C)</p> Signup and view all the answers

Which of the following equally concentrated solution has the lowest pH?

<p>NaCN (aq) (C)</p> Signup and view all the answers

The solubility degree of CuS salt in water is estimated in the unit ----------

<p>mol/L (A)</p> Signup and view all the answers

The solubility degree of copper (II) iodate Cu(IO3)2 is 3.3 X 10-3 M at a certain temperature. What is Ksp at the same temperature?

<p>1.1x10-5 (B)</p> Signup and view all the answers

Which of the following salts from a basic solution?

<p>NaNO2 (C)</p> Signup and view all the answers

If the solubility degree of aluminum hydroxide AL(OH)3 in water equals 1x10-6 mol/L, calculate the solubility product.

<p>2.7 x 10^-24</p> Signup and view all the answers

Flashcards

pH above 7

A solution with a pH above 7 is considered basic or alkaline. Basic solutions usually feel slippery to the touch and taste bitter.

KCN solution

KCN is the salt formed from the reaction of a strong base (KOH) and a weak acid (HCN). The hydrolysis of KCN produces OH- ions, making the solution basic.

Mixing HNO3 & KOH

Mixing equal volumes of a strong acid (HNO3) and a strong base (KOH), both at the same concentration, will neutralize each other completely, resulting in a neutral solution.

NH4NO2 solution

The solution of NH4NO2 is acidic because the Ka of the weak acid (NH4+) is greater than the Kb of the weak base (NO2-). This means the acid component is stronger and will dominate, lowering the pH of the solution.

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Salts from strong bases and weak acids

NaCN, Na3BO3, and Na2SO3 are salts formed from the reaction of strong bases (NaOH) and weak acids. These salts undergo hydrolysis in water, leading to the formation of OH- ions, which make the solution basic.

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Solubility Degree

The solubility degree (or solubility) of a substance is the maximum concentration of that substance that can dissolve in a given solvent at a specific temperature. It is typically expressed in units of moles per liter (mol/L).

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Solubility Product (Ksp)

The solubility product (Ksp) is an equilibrium constant that represents the product of the concentrations of ions in a saturated solution of a sparingly soluble ionic compound. It is a measure of the extent to which the compound dissolves in water.

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Ksp of Cu(IO3)2

The solubility product (Ksp) of Cu(IO3)2 is calculated by multiplying the concentrations of the ions in the saturated solution raised to their respective stoichiometric coefficients. In this case, the Ksp value is 1.4x10-7 based on the given solubility degree.

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NaNO2 solution

NaNO2, the salt formed from the reaction of a strong base (NaOH) and a weak acid (HNO2), creates a basic solution. Hydrolysis occurs in water, releasing OH- ions.

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Ksp of Aluminum hydroxide

Aluminum hydroxide (Al(OH)3) is a sparingly soluble salt. Its solubility product (Ksp) is calculated by multiplying the concentrations of its ions (Al3+ and OH-) raised to their stoichiometric coefficients in a saturated solution. Since the solubility is 1x10-6 mol/L, the Ksp is [1x10-6] x [3x10-6]^3 = 2.7x10-17.

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Study Notes

Chemistry Exam - SEC 3

  • Question 1: 0.3M KCN has a pH above 7

  • Question 2: NaH2PO4 solution is acidic (pH below 7).

  • Question 3: Mixing equal volumes of 0.25M nitric acid and potassium hydroxide solutions produces an amphoteric solution

  • Question 4: NH4NO2 solution is acidic despite being produced from the neutralization of a weak acid and weak base because Ka < Kb .

  • Question 5: NaCN (aq) has the lowest pH among the given equally concentrated solutions.

Solubility and Other Concepts

  • Question 6: Solubility degree of a CuS salt is measured in mol/L.

  • Question 7: Given the solubility of copper (II) iodate (Cu(IO3)2) as 3.3 x 10⁻³ M, the Ksp is 1.1 x 10⁻⁵

  • Question 8: NaNO₂ is a basic solution.

  • Question 9: The solubility of Aluminum hydroxide (Al(OH)₃) is 1 x 10⁻⁶ mol/L. The solubility product (Ksp) needs to be calculated using this information. (Note: The calculation is not provided in the given text).

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Chemistry SEC 3 Past Paper Quiz PDF

Description

Test your understanding of acids, bases, and solubility concepts with our chemistry quiz for SEC 3 students. Covering various topics, including pH values and ion concentrations, this quiz will challenge your knowledge and problem-solving skills. Prepare to reinforce your learning with practical questions related to chemical solutions.

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