Answer to Question #119864 in General Chemistry for Joyce Daliz

Question

Calibration curve for Red 40(C18H14N2S2O8- use this molecular formula) The slope was calculated to be 2.1033x10^4. The intercept of the calibration curve is 0.0039. The equation is y= 2.1033x10^4x +0.0039.

5. A sample of powdered drink mix with a mass of 0.2548grams is dissolved in water to make 250.00mL of solution. A sample of this solution is placed in the spectrophotometer and its absorbance is measured as 0.3110. Based on the calibration curve above, calculate the molarity of Red 40 in the unknown.

6. How many grams of Red40 are in the drink mix solution described in question #5?

7. What is the % by mass of Red40 in the drink mix powder described in questions #5 and #6?

Answer 1

5. 2,244

6. 0,0144

7. 72