Question

Can someone please answer the questions on the bottom?

DATA SHEET STANDARDIZATION DATA Weight of beaker PHOSPHATE ANALYSIS 16431 イ64,84 Weight of beaker with NaH PO Average- 025 Trial 1 Trial 2 for distilled water blank for tap water blank o, Z Instructor's signature: Standards: Standard 3 Standard 4 Standard2 1.5 ml Standard 1 5.0 ml ml Standard Phosphate Soln 0.80 ml A Reading 1 A Reading 2 Average A 3.0 ml イ95 Instructor's signature: APR PHOSPHATE UNKNOWN UNKNOWN number Absorbance of unknown Volume Used m 276 52Average A o 2225 COLA VOLUME of COLA used2ml Average A 5s Average A u ? SS -20 s 2 A's for COLA BLANK A's for COLA CALCULATED VALUES mM Calculated Conc. of Standard Phosphate Solution Conc of individual Standards: Standard 1 Standard 2 Standard3 Standard 4 mM PHOSPHATE UNKNOWN Absorbance of measured solution. Concentration of measured solution (from plot) Concentration of PHOSPHATE UNKNOWN mM mM COLA Unknown Absorbance of measured Cola solution Concentration of measured Cola solution (from plot) Concentration of phosphate in COLA Grams of phosphoric acid per 12 oz can (12 oz = 355 ml) mM mM 85

Answer 1

Hello. See it is not difficult. But tell me first in how muuch volume of water you have used to dissolve NaH2PO4. From this you can calculate Molarity of phispphos solution.

Second point what is the total volume in Standard solution 1, 2 3 and 4. Using dilution method calculate Molarity of Phosphate solution in standards.

Then make graph b/w Absorption and molarity of standard solutions. Find the equation of line passing through origin.

Now calculate molarity of unknown phosphate solution.

Similarly for cola solution.