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CSEF · 2014 Product Science (Physical) (Junior Division Only) Second Award

Sameer Ahmed · Fairmont Private Junior High School, Anaheim, Orange County

Overview

Objectives/Goals Objective: My objective was to test different types of metal cooking pots to determine which one would leach the most amounts of metal in a 25% citric acid solution boiled for 30 minutes. Goal: To be able to determine which cooking pot leached the most amount of metals into the citric acid solution. Tested: Cast iron, aluminum, stainless steel, and nonstick pots. Methods/Materials Methods: 1.) Make citric acid solution; 2.) Boil 200 mL of the solution in each pot for 30 minutes; 3.) Place boiled solution samples into test tubes and add chemical indicators; 4.) Place test tubes with chemical indicators into the spectrophotometer; 5.) Compare results Materials: 2-4 quart aluminum cooking pots; 2-4 quart stainless steel cooking pots; 2-4 quart cast iron cooking pots; 2-4 quart nonstick pots; Spectronic 20 Spectrophotometer; Spectrophotometer vials; Test tubes; 4- Test tube racks; 2 lbs- Citric acid; 3 liters- Deionized water; Lab coat; Paper towels; 8 Hotplates; 1-Magnetic mixer; 2- 4000 mL glass flasks; 1- 2 liter glass beaker; 1- 250 mL glass beaker. 1- Scale; 1- Scale tray; 1- Spoon; 8 Timers; 1- Safety goggles; 1- Face splatter shield; Latex gloves; 2- Heat resistant gloves; 4 drops of 6 molar of HNO3; 5 mL of 1 molar of KSCN; 2 ml of Na2CO3; 5 mL of a 0.1 molar solution of Na2S. Results All of the cooking pots showed traces of leaching. Cast iron leached the most Aluminum leached the second most Nonstick leached the third most Stainless Steel leached the least Conclusions/Discussion Through using chemical indicators and a spectrophotometer, I was able to conclude that cast iron leached the most.

Summary statement

I tested different types of metal cooking pots to determine which one would leach the most amounts of metal in a 25% citric acid solution boiled for 30 minutes using chemical indicators and a spectrophotometer.

Help received

Used lab equipment at Cochise College, Arizona under the supervision of Mrs. Tasneem Ashraf; My Science and English teachers helped proofread my board. My parents helped me build support systems and attaching all needed items to my board.

Awards (1)

Competition history

  • CSEF 2014 Product Science (Physical) (Junior Division Only) · Entry J2101

Resources

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