A solution of 500 ml of 0.2 M KOH and 500 ml of 0.2 M HCl is mixed and stirred; the rise in temperature is T 1 . The experiment is repeated using 250 ml each of solution, the temperature raised is T

Question

A solution of 500 ml of 0.2 M KOH and 500 ml of 0.2 M HCl is mixed and stirred; the rise in temperature is T 1 ​ . The experiment is repeated using 250 ml each of solution, the temperature raised is T 2 ​ . Which of the following is true

TestHub · Accepted Answer

KOH + HCl → KCl + H₂O Concept: q = m C Δ T and Δ T ∝ t o t a l ma sso f so l u t i o n m o l esre a c t in g ​ Case 1: 500 ml + 500 ml → 0.1 mol each Case 2: 250 ml + 250 ml → 0.05 mol each Temperature rise: Δ T = ma ss × C h e a t re l e a se d ​ In both cases, moles of acid = moles of base = half of total volume, but the mass of solution halves proportionally, so Δ T stays the same.

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