AP chemistry Big idea 1 Titration of Milk.

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Presentation transcript:

AP chemistry Big idea 1 Titration of Milk

Safety Must wear aprons Gloves goggles Disodium EDTA dehydrate- http://www.labchem.com/tools/msds/msds/LC13750.pdf Calcium carbonate- http://www.sciencelab.com/msds.php?msdsId=9927119 6M HCl http://www.sciencelab.com/msds.php?msdsId=9924285 8 M NH3 http://www.sciencelab.com/msds.php?msdsId=9922918 0.1 M Na2S http://www.sciencelab.com/msds.php?msdsId=9927604 0.1 M Magnesium chloride http://www.sciencelab.com/msds.php?msdsId=9926023 Ammonium chloride http://www.sciencelab.com/msds.php?msdsId=9927431 Calmagite http://www.sciencelab.com/msds.php?msdsId=9923282 Safety Must wear aprons Gloves goggles

Pre lab Mass of calcium carbonate needed so that a titration with a 0.010 M EDTA would require 25mL titrant to achieve end point 25mL EDTA x 0.01 𝑚𝑜𝑙 𝐸𝐷𝑇𝐴 1000 𝑚𝐿 𝐸𝐷𝑇𝐴 x 1 mol CaCO3 1 mol EDTA x 100.1 g CaCO3 1 mol CaCO3 = 0.025 g CaCo3

Prelab Acid required for calcium carbonate to fully dissociate. Determine the amount of 6 M HCl that must be added to dissolve the mass of CaCO3 you calculated in ?1 CaCO3 + CO3 Ca + CO3 2H + CO3  H2CO3  H2O +CO2 0.025 g CaCo3 x 1 mol CaCO3 100.1 g CaCO3 x 2 𝑚𝑜𝑙 𝐻𝐶𝑙 1 mol 𝐶𝑎𝐶𝑂3 x 1000 mL HCl 6 mol HCl = .083 mL HCl

How it works

Concentration of EDTA g CaCO3 mL EDTA x 1 mol CaCO3 100.1 g CaCO3 x 1 mol EDTA 1 mol CaCO3 x 1000 mL EDTA 1 L EDTA =___________ M

Hard water