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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: buhjammies on October 01, 2009, 11:39:17 PM

Title: CaC2O4 + KMnO4?? NEED HELP PLEASE.
Post by: buhjammies on October 01, 2009, 11:39:17 PM

The problem is:

Calcium Oxalate (CaC2O4) is insoluble in water. For this reason it can be used to determine the amount of Ca2+ ions in fluids such as blood. The calcium oxalate isolated from blood is dissolved in acid and titrated against a standardized KMnO4 solution as shown in Problem 4.96. In one test it is found that the calcium oxalate isolated from a 10.0mL sample of blood requires 24.2 mL of 9.56 x 10-4 M KMnO4 for titration. Calculate the number of milligrams of calcium per milliliter of blood.

Chemistry 2 is so hard. T___________T;;

I don't know how to do anything! Please explain step by step. I'm so lost!

Title: Re: CaC2O4 + KMnO4?? NEED HELP PLEASE.
Post by: renge ishyo on October 02, 2009, 12:08:51 AM

Here are some hints to get you started:

1. You are going to use M₁V₁ = M₂V₂ in step #1.

2. Once you have found the concentration of calcium ions (i.e the molarity) you can use dimensional analysis to convert this to a concentration with mg/mL for units.

Title: Re: CaC2O4 + KMnO4?? NEED HELP PLEASE.
Post by: AWK on October 02, 2009, 01:58:39 AM

Start from a balanced reaction

Title: Re: CaC2O4 + KMnO4?? NEED HELP PLEASE.
Post by: Borek on October 02, 2009, 03:24:35 AM

Idea behind titration: http://www.titrations.info