Question

Please help me with the solutions for these multiple choice questions?

I think most of my answers are incorrect.

Thank you, and much appreciated!

Use the following information for Questions 1 and 2 A sample of water containing Na' was analysed using AAS by first preparing a series of standard solutions then their absorbance was measured to obtain the following calibration graph. 0.201ー 0.15 Absorbance 0.10 0.05 0 100 200 300 400 Concentration of Na+ (aq) in mgl Question1 The water sample was found to have an absorbance 0.175. The concentration, in mg L-, of Na is closest to: A. 320 330 340 D. 350 Question 2 The concentration of the of Na" in moll 'is closest to 0.010 B. 0.015 C. 0.020 D. 0.025

Answer 1

i have answred first 5 questions as per guidlines given to us.