a) In a neutralization reaction, NaOH (aq) reacted with HCl (aq) at 21.01 o C to
ID: 1069684 • Letter: A
Question
a) In a neutralization reaction, NaOH(aq) reacted with HCl(aq) at 21.01oC to produce 80g of NaCl solution at 24oC. Calculate (q) the heat of solution in Joules. (s = 4.184 J/oC.g).
b) Two 100 mL solutions of NaOH and HCl both have a concentration of 1M. When they are mixed in a Styrofoam cup, the temperature raised from 20oC to 26.7oC. What is the heat released (q)?
c) The temperature of NaOH solution is 23 oC, and that of HCl solution is also 23 oC. When they are mixed together, the temperature of the produced solution increased to 27 oC. Is the reaction endothermic or exothermic?
Explanation / Answer
a) In a neutralization reaction, NaOH(aq) reacted with HCl(aq) at 21.01oC to produce 80g of NaCl solution at 24oC. Calculate (q) the heat of solution in Joules. (s = 4.184 J/oC.g).
dT = 24-21.01 = 2.99
Q = m*C*(Tf-Ti) = 80*4.184*(2.99)= 1000.8128 J
b)
dT = 26.7-20 = 6.7
Q = m*C*dT = 100*2*4.184*(6.7) = 5606.56 J
c)
if reaction increases in temperature, the system is releasing heat, so it is EXOthermic
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