A technician was asked to find the concentration of potassium ions in a dilute solution using a flame photometer - Edexcel - GCSE Chemistry - Question 7 - 2021 - Paper 1
Question 7
A technician was asked to find the concentration of potassium ions in a dilute solution using a flame photometer.
(i) The technician first produced a calibration cu... show full transcript
Worked Solution & Example Answer:A technician was asked to find the concentration of potassium ions in a dilute solution using a flame photometer - Edexcel - GCSE Chemistry - Question 7 - 2021 - Paper 1
Step 1
Plot the Points from the Data
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Answer
Using the data from Figure 9:
For the concentration of potassium ions 0.025 mol dm−3, the display reading is 180.
For 0.050 mol dm−3, the reading is 280.
For 0.100 mol dm−3, the reading is 440.
For 0.200 mol dm−3, the reading is 580.
For 0.500 mol dm−3, the reading is 900.
Mark these points accurately on the grid provided.
Step 2
Draw the Best Fit Curve
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Answer
After plotting the points, draw a smooth curve that best fits the data points. Make sure the curve represents the trend shown by the data accurately.
Step 3
Label the Axes
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Answer
Ensure that the x-axis is labeled as 'Concentration of potassium ions in mol dm−3' and the y-axis as 'Display reading'. Use a suitable scale that utilizes the entire grid area efficiently.
