Neco 2017 Chemistry Question 2

Practice practical question 2 from the 2017 Neco Chemistry examination. This question covers Periodic Table, Flame Test, Calibration .

Neco 2017 Chemistry Practical

Topics: Periodic Table Flame Test Calibration

Question 2 NECO • 2017 • CHEMISTRY • practical

A student carries out a flame‑test experiment to determine the concentration of an unknown sodium ion solution. The following standard solutions are prepared and their flame‑emission intensities (arbitrary units) are recorded using a calibrated photometer: | Standard concentration (M) | Intensity (units) | |----------------------------|-------------------| | 0.10 | 12 | | 0.20 | 22 | | 0.30 | 31 | The unknown solution gives a flame intensity of 25 units. Answer the following questions:

Question Parts

( a )

Plot a calibration graph of intensity (y‑axis) against concentration (x‑axis) and obtain the equation of the best‑fit straight line (express the equation in the form I = mC + b).

( b )

Using the equation from part (a), calculate the concentration of the unknown sodium solution.

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About This Question

This is Neco 2017 Chemistry Question 2. It is one of the practical questions from the 2017 Neco Chemistry examination.

The question covers Periodic Table, Flame Test, Calibration .

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