titration help, Chemistry

During a titration with EDTA, using eriochrome black T as indicator to determine Ca
2+
, an
analyst obtained the following volumes of EDTA in three different trials: 5.01, 4.93 and 4.98
mL. What is the Ca
2+
concentration (mol/L) in this sample if the concentration of the EDTA
standard used was 0.035 mol/L, and the volume of sample titrated was 20.00 mL?
2) Considering the same type of experiment described in the previous question, calculate the
Ca
2+
concentration in a sample which consumes 20.05, 19.96 and 20.03 mL of a 0.0084 mol/L
EDTA solution in three different trials. In this case, the sample volume used was 15.00 mL.
3) What is the CaCO3 mass percentage in a seashell sample presenting 0.0158 g of this
compound for an initial sample mass of 0.0165 g?
Do not forget to report the correct number of significant figures. You may also want to use
the following equation in exercises 1 and 2: n = M x V, where n is the number of mols, M is
the molarity in mol/L, and V is the volume in L.
Posted Date: 10/9/2012 4:09:21 PM | Location : United States







Related Discussions:- titration help, Assignment Help, Ask Question on titration help, Get Answer, Expert's Help, titration help Discussions

Write discussion on titration help
Your posts are moderated
Related Questions

Q. Explain Molarity and Replacement Reactions? Ans. Frequently in the chemistry lab we are confronted with situations where we are interested in the yield of a certain rea

Angular functions: 'shapes'   The mathematical functions for atomic orbitals may be described as a product of two factors: the radial wavefunction defines the behavior of th

GEOCHEMISTRY The chemical processes taking place in the crust are especially important as they have build ores, concentrated mineral deposits that are exploited industrially

Chemical Properties of Ethers Ethers are fairly stable compounds. These are not simply reacted along with alkalies, dilute mineral acids, active metals, oxidising agents within

A diluted polymer solution with a density of 1130 kg/m3 was extruded by a capillary tube of 3.5 mm internal diameter and 1 m long.  The following results were contained at 25°C.

Step growth or condensation polymerisation In this form of polymerisation monomers usually consist of two functional sets, that is difunctional monomers. In that method no init

Position of the substituent - IUPAC system of nomenclature Number of the carbon atoms in the base chain like 1, 2, 3,....... etc. starting from the end that gives lower numb

The K sp of the phosphate fertilizer CaHPO 4 .2 H2O is 2.7 x 10 -7 at 25 o C.  What is the molar concentration of a saturated solution?  What mass of this compound will dissolve

Metallic Acetates - Acetic Acid For making several useful metallic acetates, illustrated as: (1) Basic copper acetate that is used for making green paints. (2) Al, Fe and