CH 17: Acid-base titrations

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Questions and Answers

What is the DEFINITION of the endpoint in a titration?

  • The point where the reaction has reached its maximum temperature
  • The point where the pH of the solution is exactly 7.0
  • The point where the titrant is completely consumed
  • The point where the indicator changes color, signifying the reaction's completion (correct)

What is the STOICHIOMETRIC RATIO between oxalic acid (H2C2O4) and sodium hydroxide (NaOH) in their titration reaction?

  • 1:2 (correct)
  • 2:3
  • 2:1
  • 1:1

Which of the following is NOT a piece of APPARATUS used in a standard acid-base titration?

  • Burette
  • Volumetric flask
  • pH meter (correct)
  • Pipette

What is the MAIN PURPOSE of preparing a STANDARD SOLUTION in a titration?

<p>To determine the unknown concentration of the acid or base (A)</p> Signup and view all the answers

Which SAFETY PRECAUTION should be taken when performing acid-base titrations?

<p>All of the above (D)</p> Signup and view all the answers

What is the FORMULA used to calculate the unknown concentration of the base solution in an acid-base titration?

<p>$C_a V_a = C_b V_b$ (B)</p> Signup and view all the answers

Which INDICATOR is suitable for a titration between a STRONG ACID and a STRONG BASE?

<p>Phenolphthalein (D)</p> Signup and view all the answers

What is the RECOMMENDED PROCEDURE for ENSURING RELIABLE RESULTS in an acid-base titration?

<p>Both b and c (C)</p> Signup and view all the answers

What is the MAIN PURPOSE of the TITRATION PROCESS in an acid-base reaction?

<p>To find the concentration of the unknown solution (C)</p> Signup and view all the answers

Which type of ACID-BASE TITRATION would have an EQUIVALENCE POINT above pH 7?

<p>Weak acid-strong base (D)</p> Signup and view all the answers

What is the primary purpose of an acid-base titration?

<p>To determine the concentration of an unknown acid or base solution (B)</p> Signup and view all the answers

Which indicator is suitable for titrations involving strong acids and weak bases?

<p>Methyl Orange (D)</p> Signup and view all the answers

What is the purpose of an indicator in an acid-base titration?

<p>To determine the equivalence point of the titration (C)</p> Signup and view all the answers

Which indicator is best for titrations of strong bases and weak acids?

<p>Phenolphthalein (B)</p> Signup and view all the answers

What is the equivalence point in an acid-base titration?

<p>The stage where the amount of added titrant is stoichiometrically equivalent to the quantity of substance in the sample (C)</p> Signup and view all the answers

Which indicator is effective for titrations involving strong acids with strong bases?

<p>Bromothymol Blue (D)</p> Signup and view all the answers

What is the difference between the equivalence point and the endpoint in an acid-base titration?

<p>The equivalence point is when the stoichiometric amounts are equal, and the endpoint is when the indicator changes color (D)</p> Signup and view all the answers

Which of the following is NOT a factor in choosing an indicator for an acid-base titration?

<p>The concentration of the titrant solution (C)</p> Signup and view all the answers

What is the purpose of using a titrant of known concentration in an acid-base titration?

<p>To determine the concentration of the unknown solution (A)</p> Signup and view all the answers

Which statement about acid-base titrations is correct?

<p>The indicator changes color at the equivalence point (C)</p> Signup and view all the answers

What is the purpose of performing stoichiometric calculations in an acid-base titration?

<p>To determine the molar ratio between the acid and base in the reaction (B)</p> Signup and view all the answers

What is the main purpose of using a standard solution in an acid-base titration?

<p>To determine the concentration of the unknown solution (C)</p> Signup and view all the answers

Which indicator is most suitable for titrating a strong acid with a strong base?

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

What is the formula used to calculate the unknown concentration of the base solution in an acid-base titration?

<p>$C_a V_a = C_b V_b$ (A)</p> Signup and view all the answers

What is the purpose of the titration process in an acid-base reaction?

<p>To find the unknown concentration of one of the solutions (B)</p> Signup and view all the answers

What is the recommended procedure for ensuring reliable results in an acid-base titration?

<p>Perform multiple titrations and take the average (B)</p> Signup and view all the answers

Which of the following is NOT a factor in choosing an indicator for an acid-base titration?

<p>The volume of the titrant required to reach the endpoint (D)</p> Signup and view all the answers

What is the difference between the equivalence point and the endpoint in an acid-base titration?

<p>The equivalence point is the point where the reaction is complete, while the endpoint is the point where the indicator changes color. (B)</p> Signup and view all the answers

What is the stoichiometric ratio between oxalic acid (H2C2O4) and sodium hydroxide (NaOH) in their titration reaction?

<p>1:2 (A)</p> Signup and view all the answers

Which indicator is suitable for titrations involving strong acids and weak bases?

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

Which step is crucial in determining the endpoint of an acid-base titration?

<p>Selecting the appropriate indicator (A)</p> Signup and view all the answers

At what point in an acid-base titration is the amount of added titrant stoichiometrically equivalent to the quantity of the sample?

<p>Equivalence point (A)</p> Signup and view all the answers

Which factor should NOT be considered when choosing an indicator for an acid-base titration?

<p>The cost of the indicator (B)</p> Signup and view all the answers

If the titration involves a strong acid and a weak base, which indicator would be most suitable?

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

What is the primary reason for using a titrant of known concentration in an acid-base titration?

<p>To determine the concentration of the unknown solution (C)</p> Signup and view all the answers

Which statement about the equivalence point and endpoint in an acid-base titration is correct?

<p>The equivalence point and endpoint may or may not coincide (C)</p> Signup and view all the answers

In a titration between a strong acid and a strong base, which indicator would be most appropriate?

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

What is the primary purpose of preparing a standard solution in an acid-base titration?

<p>To determine the concentration of the unknown solution (D)</p> Signup and view all the answers

Which type of acid-base titration would have an equivalence point above pH 7?

<p>Weak acid with strong base (B)</p> Signup and view all the answers

What is the recommended procedure for ensuring reliable results in an acid-base titration?

<p>Perform the titration in triplicate and take the average (A)</p> Signup and view all the answers

Which of the following is the MAIN PURPOSE of performing STOICHIOMETRIC CALCULATIONS in an acid-base titration?

<p>To determine the concentration of the unknown solution based on the balanced chemical equation (B)</p> Signup and view all the answers

In a titration between a WEAK ACID and a STRONG BASE, which INDICATOR would be MOST SUITABLE?

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

What is the STOICHIOMETRIC RATIO between OXALIC ACID (H2C2O4) and SODIUM HYDROXIDE (NaOH) in their TITRATION REACTION?

<p>1:2 (C)</p> Signup and view all the answers

Which of the following is the FORMULA used to CALCULATE the UNKNOWN CONCENTRATION of the BASE SOLUTION in an ACID-BASE TITRATION?

<p>$C_a V_a = C_b V_b$ (A)</p> Signup and view all the answers

Which of the following SAFETY PRECAUTIONS should be taken when performing ACID-BASE TITRATIONS?

<p>All of the above (D)</p> Signup and view all the answers

What is the PRIMARY PURPOSE of preparing a STANDARD SOLUTION in an ACID-BASE TITRATION?

<p>To ensure the accuracy of the titration measurements (A)</p> Signup and view all the answers

Which INDICATOR is MOST SUITABLE for a TITRATION between a STRONG ACID and a STRONG BASE?

<p>Phenolphthalein (B)</p> Signup and view all the answers

What is the PRIMARY PURPOSE of the TITRATION PROCESS in an ACID-BASE REACTION?

<p>To determine the concentration of the unknown solution (B)</p> Signup and view all the answers

Which STEP is CRUCIAL in DETERMINING the ENDPOINT of an ACID-BASE TITRATION?

<p>Measuring the volume of the titrant (D)</p> Signup and view all the answers

What is the DEFINITION of the ENDPOINT in an ACID-BASE TITRATION?

<p>The point at which the indicator changes color (B)</p> Signup and view all the answers

What is the primary purpose of using a titrant of known concentration in an acid-base titration?

<p>To determine the concentration of the unknown analyte solution (B)</p> Signup and view all the answers

Which indicator would be most suitable for a titration between a strong acid and a weak base?

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

What is the primary difference between the equivalence point and the endpoint in an acid-base titration?

<p>The equivalence point is the point where the titrant and analyte are stoichiometrically equivalent, while the endpoint is the point where the indicator changes color. (A)</p> Signup and view all the answers

Which of the following is NOT a factor to consider when choosing an indicator for an acid-base titration?

<p>The melting point of the indicator (D)</p> Signup and view all the answers

What is the primary purpose of preparing a standard solution in an acid-base titration?

<p>To determine the concentration of the unknown analyte solution (C)</p> Signup and view all the answers

What is the STOICHIOMETRIC RATIO between oxalic acid (H2C2O4) and sodium hydroxide (NaOH) in their titration reaction?

<p>1:2 (B)</p> Signup and view all the answers

Which indicator would be most suitable for a titration between a strong acid and a strong base?

<p>Bromothymol blue (B)</p> Signup and view all the answers

What is the FORMULA used to calculate the unknown concentration of the base solution in an acid-base titration?

<p>C_unknown = (V_unknown * C_titrant) / V_titrant (D)</p> Signup and view all the answers

Which type of acid-base titration would have an equivalence point above pH 7?

<p>Titration of a weak acid with a strong base (C)</p> Signup and view all the answers

What is the primary reason for using a titrant of known concentration in an acid-base titration?

<p>To determine the concentration of the unknown analyte solution (A)</p> Signup and view all the answers

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