Photo AI

A student carried out an experiment to find the temperature rise for a reaction between hydrochloric acid and sodium hydroxide solution - AQA - A-Level Chemistry - Question 4 - 2018 - Paper 3

Question icon

Question 4

A-student-carried-out-an-experiment-to-find-the-temperature-rise-for-a-reaction-between-hydrochloric-acid-and-sodium-hydroxide-solution-AQA-A-Level Chemistry-Question 4-2018-Paper 3.png

A student carried out an experiment to find the temperature rise for a reaction between hydrochloric acid and sodium hydroxide solution. - The student used a measur... show full transcript

Worked Solution & Example Answer:A student carried out an experiment to find the temperature rise for a reaction between hydrochloric acid and sodium hydroxide solution - AQA - A-Level Chemistry - Question 4 - 2018 - Paper 3

Step 1

Plot a graph of temperature against time

96%

114 rated

Answer

  1. Begin by marking the temperature values on the Y-axis and the time intervals on the X-axis, using the grid provided.

  2. Plot the points for each time and corresponding temperature from Table 3:

    • (0, 19.8)
    • (1, 19.8)
    • (2, 19.8)
    • (3, 19.8)
    • (4, 21.6)
    • (5, 21.7)
    • (6, 21.5)
    • (7, 21.4)
    • (8, 21.3)
    • (9, 21.2)
    • (10, 21.1)
    • (11, 21.1)
    • (12, 21.1)

  3. After marking the points, draw suitable lines to connect the points accurately. It helps to smooth the curve as you create the line of best fit, considering the nature of the reaction and temperature change.

  4. Extend the lines to determine the value of the temperature at the fourth minute by extrapolating from the trend observed.

Step 2

Find the temperature rise, ΔT, at the fourth minute

99%

104 rated

Answer

  1. The starting temperature at time 0 min is 19.8 °C.

  2. At time 4 min, from the graph, the temperature increased to 21.6 °C.

  3. Calculate ΔT using the formula:

    riangleT=Tfinal−Tinitial=21.6ext°C−19.8ext°C=1.8ext°C riangle T = T_{final} - T_{initial} = 21.6 ext{ °C} - 19.8 ext{ °C} = 1.8 ext{ °C}

  4. Therefore, the temperature rise, ΔT, is 1.8 °C.

Join the A-Level students using SimpleStudy...

97% of Students

Report Improved Results

98% of Students

Recommend to friends

100,000+

Students Supported

1 Million+

Questions answered

;