Map A Sapling Learning The neutralization of H3PO4 with KOH is exothermic. HIPO,

Question

Map A Sapling Learning The neutralization of H3PO4 with KOH is exothermic. HIPO, (aq) 3KoHlaq) 3H,oli) KuPO (aq)+ 173.2 kJ 55.0 mL of 0.200 M H3PO4 is mixed with 55.0 mL of 0.600 M KOH initially at 21.29 °C. Predict the final temperature of the solution if its density is 1.13 g/mL and its specific heat is 3.78 Jl(g aC) Assume that the total volume is the sum of the individual volumes. Number final AO Previous Give Up & View Solution Check Answer Next Ex Late su Points Grade Descri Policie You ca You ca give u You ca until y You loo answe attem CD eTex o Help

Explanation / Answer

mol of H3PO4 reacting = M*V

= 0.200 M * 0.055 L

= 0.011 mol

According to reaction,

for 1 mol of H3PO4, heat released = 173.2 KJ

so, for 0.011 mol, heat released = 0.011 mol * 173.2 KJ

= 1.9052 KJ

= 1905.2 J

This heat will be absorbed by solution which will increase temperature of solution

volume of solution = 55.0 mL + 55.0 mL = 110 mL

mass of solution,

m = density * volume

= 1.13 g/mL * 110 mL

= 124.3 g

now use:

Q = m*C*(Tf-Ti)

1905.2 = 124.3 * 3.78 * (Tf - 21.29)

(Tf - 21.29) = 4.05

Tf = 25.34 oC

Answer: 25.34 oC

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