Question

to determine the enthalpy of neutralization, you will construction a time verus temperature graph. why is this graph necessary?

WA UWEP 1. To determine the enthalpy of neutralization, you will construction a time versus temperature graph. Why is this graph necessary? 2. A student added 2.500 g MgSO4(MM 120.4) to a 60.000 g water sample. The initial temperature of the water was 20.50 *C. After adding the salt, the temperature rose to 27.00°c. a) What is the value of AT? b) How many moles of MgSO4 were used? 3. A reaction has a AH = 57 kJ/mol. Is this reaction endothermic or exothermic? 4. Identify the limiting reactant in a reaction that uses 50 ml of 0.993 M HCl and 50 mL of 1.02 M NaOH. 5. What is the name of the apparatus used to determine "heat of reaction? (Hint: It's not coffee cup)

Answer 1

Solution:

The time vs temperature graph is required in the determunation of enthalpy of neutralization because one can take tenperature reading over a period of time to draw the best straight lines through data and extrapolate those lines to the time of mixing.

Thus, on extrapolation of straight lines, we can calculate the value of temperature change (ΔT).