Pre-Laboratory Questions 1. 2500 grams of water at 4500 was added to 2500 grams

Question

Pre-Laboratory Questions 1. 2500 grams of water at 4500 was added to 2500 grams of water at 2030 C in a coffee cup mixing, the equilibrium temperature attained by the system was 31.40 C. The specific heat of water is 4.184 J/g C. What is the calorimeter constant for the coffee cup calorim 2. 25.00 mL of 1.00 M HCI is mixed with 25.00 mL of 1.00 M LiOH in the calorimeter (same calorimeter from Question 1). The initial temperature of the Ha and LiOH solutions is 20.50 °C, and the equilibrium temperature of the reaction mixture is 38.50 °C. Assume the density and the specific heat of the solution is the same as for water, 1.00 g/mL and 4.184 J/g°C, respectively. a. Determine quolution Cheat absorbed or released by the reaction mixture)? custom page

Explanation / Answer

1)

heat lost by the water = heat gain by the calorimeter

(m Cp dT) water = (m cp dT) calorimeter

25 x 4.184 x (45 - 31.4) = (25+ 25) x Cp x (31.40 - 20.30)

Cp = 2.56 J / g oC

calorimeter constant = 2.56 J / g oC

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