Question

This is about a chemistry lab for finding Na+ in apple juice. The claim apple juice for Na+ is 30g. mg Na per serving should be around 30 g.

Do calulation to fill out this table. sample mL will have to be convert to g.

The standard solution equation is 0.503*x+0.0914. Find x not y.

Sample	Sample use (mL)	Absorbance	[Na+] (ppm)	Na weight in sample (g)	mg Na per serving
Juice 1	2mL	0.324
Juice 2	2mL	0.391
Juice 3	2mL	0.380
Juice 4	2mL	0.341

Answer 1

Ans.

# Note the following points-

            1. Since no dilution event is mentioned in the question, it’s assumed that the apple juice samples are directly read in spectrophotometer. If any dilution step is involved in the procedure, account it accordingly to get the actual values.

            2. Since the density of apple juice sample is NOT mentioned in the question, it’s assumed to be 1.00 g/mL

            3. 1 ppm = 1 mg/ L ; Mass in mg = [ppm] x Volume in liters

                        1 g = 1000 mg