Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature? [2025]

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Q.
Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature [2025]

1 45 mL ${CH}_{3} COOH$ and 25 mL NaOH

2 50 mL HCl and 20 mL NaOH

3 30 mL ${CH}_{3} COOH$ and 30 mL NaOH

4 30 mL HCl and 30 mL NaOH

Ans.
(4)

Reactants Millimoles of acid and base reacted with each other

(45 mL × 1 M = 45 mmol) ( ${CH}_{3} COOH$ ) + (25 mL × 1 M = 25 mmol) NaOH 25

(50 mL × 1 M = 50 mmol) HCl + (20 mL × 1 M = 20 mmol) NaOH 20

(30 mL × 1 M = 30 mmol) ${CH}_{3} COOH$ + (30 mL × 1 M = 30 mmol) NaOH 30

(30 mL × 1 M = 30 mmol) HCl + (30 mL × 1 M = 30 mmol) NaOH 30

More are the number of moles of acid-base reacted, more is heat of neutralization. Heat of neutralization of strong acid (HCl) v/s strong base (NaOH) is more than that of weak acid ( ${CH}_{3} COOH$ ) v/s strong base (NaOH). This is because some heat released in neutralization process is utilized in dissociation of weak acid.

Solution

Q.
Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature [2025]

1 45 mL ${CH}_{3} COOH$ and 25 mL NaOH

2 50 mL HCl and 20 mL NaOH

3 30 mL ${CH}_{3} COOH$ and 30 mL NaOH

4 30 mL HCl and 30 mL NaOH

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Reactants	Millimoles of acid and base reacted with each other
(45 mL × 1 M = 45 mmol) ( ${CH}_{3} COOH$ ) + (25 mL × 1 M = 25 mmol) NaOH	25
(50 mL × 1 M = 50 mmol) HCl + (20 mL × 1 M = 20 mmol) NaOH	20
(30 mL × 1 M = 30 mmol) ${CH}_{3} COOH$ + (30 mL × 1 M = 30 mmol) NaOH	30
(30 mL × 1 M = 30 mmol) HCl + (30 mL × 1 M = 30 mmol) NaOH	30

Solution

Q. Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature [2025]

1 45 mL CH3COOH and 25 mL NaOH

2 50 mL HCl and 20 mL NaOH

3 30 mL CH3COOH and 30 mL NaOH

4 30 mL HCl and 30 mL NaOH

Want Us to Email you About Special Offers & Updates?

Q.
Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature [2025]

1 45 mL ${CH}_{3} COOH$ and 25 mL NaOH

3 30 mL ${CH}_{3} COOH$ and 30 mL NaOH