Titrasi Asam Basa | Kimia SMA | Tetty Afianti

Summary

In this chemistry lesson, the instructor discusses acid-base titration, a method for determining the concentration of acid and base solutions. The video explains key terms like standard solution, equivalence point, and indicators. Several examples are presented to illustrate how titration calculations work, including finding the concentration of sulfuric acid, sodium hydroxide, and barium hydroxide. The lesson also explores related concepts such as molarity, valency, and neutralization reactions. Practical problems are provided, and viewers are encouraged to practice further with exercises from a blog for additional learning.

Takeaways

• 😀 Acid-base titration is a technique used to determine the concentration of acid or base solutions through neutralization reactions.
• 😀 A neutralization reaction occurs when an acid and a base react to form salt and water.
• 😀 In titration, the standard solution (titrant) has a known concentration, and its volume is measured to determine the unknown concentration of the other solution.
• 😀 The equivalence point is when the amount of acid equals the amount of base in the reaction, resulting in complete neutralization.
• 😀 Indicators are used to signal the end of the reaction by changing color, signaling the point at which the acid and base have reacted in equivalent amounts.
• 😀 The titration formula is: (A × C₁ × V₁) = (B × C₂ × V₂), where A and B represent the valence of acid and base, C₁ and C₂ are their concentrations, and V₁ and V₂ are their volumes.
• 😀 Valence refers to the number of hydrogen (H⁺) ions in acids and hydroxide (OH⁻) ions in bases.
• 😀 Example 1: To find the concentration of sulfuric acid (H₂SO₄) titrated with sodium hydroxide (NaOH), use the titration formula, leading to a result of 0.067 M concentration for H₂SO₄.
• 😀 Example 2: For barium hydroxide (Ba(OH)₂) titrated with hydrochloric acid (HCl), the concentration of Ba(OH)₂ was found to be 0.2 M using the titration formula.
• 😀 In a neutralization reaction between Ca(OH)₂ and an acid, the amount of H⁺ ions needed to neutralize the base can be calculated using molarity and volume.
• 😀 Titration results can be used to calculate other related quantities, such as the mass of a substance (e.g., H₂SO₄) after titration, by multiplying moles with molar mass.

Q & A

What is titration in acid-base chemistry?

Titration is an analytical technique used to determine the concentration of an acid or base solution by reacting it with a solution of known concentration.

What is the role of the standard solution in titration?

The standard solution, also known as the titrant, has a known concentration and is used to react with the solution whose concentration is unknown.

What is the equivalence point in a titration?

The equivalence point is the stage in a titration when the amount of acid equals the amount of base, resulting in complete neutralization.

What is an indicator in titration, and how does it work?

An indicator is a substance that changes color to signal the end of the titration, typically when the solution reaches its equivalence point.

What is the formula used in titration calculations?

The formula used is: A * C_A * V_A = B * C_B * V_B, where A and B represent the valencies of the acid and base, C_A and C_B are their concentrations, and V_A and V_B are the volumes of the acid and base.

How is the concentration of sulfuric acid (H2SO4) determined in a titration with sodium hydroxide (NaOH)?

The concentration of sulfuric acid is determined by applying the titration formula, using the known concentration and volume of NaOH to calculate the unknown concentration of H2SO4.

How do you calculate the concentration of barium hydroxide (Ba(OH)2) from a titration with hydrochloric acid (HCl)?

To calculate the concentration of Ba(OH)2, use the titration formula, substituting the known concentration and volume of HCl to solve for the concentration of Ba(OH)2.

What does 'valency' refer to in titration calculations?

Valency refers to the number of hydrogen ions (H+) in an acid or hydroxide ions (OH-) in a base that participate in the neutralization reaction.

How can the number of H+ ions required to neutralize a base be determined?

The number of H+ ions required to neutralize a base is equivalent to the number of moles of base present, as both the acid and base react in a 1:1 ratio in a neutralization reaction.

How do you calculate the molar mass of sulfuric acid from titration data?

To calculate the molar mass of sulfuric acid, first determine the number of moles of H2SO4 from the titration, then multiply by its molar volume and use the formula for molar mass.