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
Question: (i) List the different members of the marine mammalian groups. (ii) Explain the term "stranding" and give some reasons why cetaceans strand? (iii) Cetacean

Draw out the Lewis structures of the following two compounds.        BeCl 2 +  2Cl- → (a)  Determine which compound is the Lewis acid and which is the Lewis base.  What are the

how to find atomicity of an element

Electrons and nuclei   The familiar planetary model of the atom was proposed by Rutherford in 1912 following experiments by Geiger and Marsden showing that all the mass of an

how does molar volume varies with: a) a decrease in temperature d) an increase in pressure


The structure of spiropentadiene The structure of spiropentadiene is shown below; it undergoes a Diels-Alder reaction with two molar equivalents of 1,3-cyclopentadiene. Spirope


difference b/w inductive and field effect

Q. Illustrate about Borohydrides? Borohydrides like NaBH 4 ,, Be(BH 4 ,) 2 and Al(BH 4 )are the salts of complex  tetrahydridoborate anion, BH - 4 ,. Since in BH - 4 ,. bor