# lab 5z - Zachary Kmieciak Chemistry Lab 11 Tammi/Cassie The...

This preview shows pages 1–3. Sign up to view the full content.

Zachary Kmieciak Chemistry Lab 11 October 11, 2007 Tammi/Cassie The Calcium in Milk Introduction The goal of this lab is to determine the amount of calcium in 2% and skim milk. Each type of milk will contain different amounts of calcium. A calcium indicator will turn the solution pink, and green if excess calcium is present. KOH is used to raise the Ph to over 13. Results and Discussion In order to determine the calcium content in the skim milk, we must first calculate the molarity of the EDTA used in the experiment. In order to do so, we must use the equation M EDTA = M(Ca 2+ ) x V(Ca 2+ ) / V EDTA . M(Ca 2+ ) = .03 [mol / L] V(Ca 2+ ) = 4.66 ml .03 x 4.66 / 5 = M EDTA V EDTA = 5.0 ml M EDTA = .028 [mol / L] Next, the moles of EDTA started with were found by multiplying the molarity of EDTA from above by the volume of EDTA used. The equation is Moles EDTA = M EDTA x V EDTA .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
M EDTA = .028 [mol / L] Start Moles EDTA = .028 x .01 V EDTA = .01L Start Moles EDTA = 2.8 x 10 -4 mol Next, we must calculate the
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 3

lab 5z - Zachary Kmieciak Chemistry Lab 11 Tammi/Cassie The...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online