Trail Plot and Calculation (1 Trail Trail (2 Based on temperature you recorded i

ID: 518471 • Letter: T

Question

Trail Plot and Calculation (1 Trail Trail (2 Based on temperature you recorded in 4-4 plot in the following chart. Sao 40 80, 120 160 200 240 280 320 180 220 240 220 260 AT oc AT's Based on the following formula, calculate solution AH. AH mass of solution)x ATxcs (hint: solution cs 3.97 JICg.oc) 2.97 AHsbni 100-16 Based on AH calculate AHnun Based on AH calculate AHnn Based on obtained HCimoles and NaoH moles, determined how many moles of reaction happened. mole Moles of reaction Calculate AHnn per mole of reaction Calculate AHns per mole of reaction AHnen per mole of reaction AHnn per mole of reaction Average AH per mole reaction of NaoH(aa) +HCl(aq) NaCl(aa) Hao()

Explanation / Answer

We use the formula to calculate Hsolution = (mass of solution)*T*Cs = (100.96 g)*(4 C)*(3.97 J.gC) = 1603.2448 J = (1603.2448 J)*(1 kJ/1000 J) = 1.603 kJ (ans).

Trial 1

Trail 2

Hsolution

1.603 kJ

1.608

Hrxn

-1.603 kJ

-1.608 kJ

The reason why Hrxn is equal in magnitude but opposite in sign to Hsolution (in other words, Hrxn = -Hsolution) is that there is no other source of heat energy. The reaction between HCl and NaOH releases heat energy (hence Hrxn is negative) which is taken up by the solution and hence Hsolution is positive.

Need the volume and concentration of both HCl and NaOH to answer the remaining questions.