titration help, Chemistry

Assignment Help:
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.

Related Discussions:- titration help

Eqivalents, how do you calculate equivalents?

how do you calculate equivalents?

Illustrate kinetic molecular theory of gases, Q. Illustrate Kinetic Molecul...

Q. Illustrate Kinetic Molecular Theory of Gases? Ans. The behavior and properties of gases can be explained by the Kinetic Molecular Theory (KMT). A gas that behaves accord

Show experimental observations of werners theory, Q. Show Experimental obse...

Q. Show Experimental observations of werners theory? Werner showed that his postulates are consistent with experimental observations. He made use of basically three kinds of ex

Structure and bonding in solids-crystals and glasses, Crystals and glasses ...

Crystals and glasses   Unlike a complex ion or molecule, which is a finite (often small) assembly of atoms, a solid has no fixed shape and size but can add atoms indefinit

Main physical properties of hydrogen sulphide, Question 1: (i) What ar...

Question 1: (i) What are the main physical properties of hydrogen sulphide? (ii) Which occupational group of workers is often exposed to hydrogen sulphide? (iii) O

Explain multimolecular and macromolecular colloids, What is the difference ...

What is the difference among multimolecular and macromolecular colloids? Give one example of each type. How are associated colloids dissimilar from these two types of colloids?

Develop a table for the water quality parameters, Develop a table for the w...

Develop a table for the water quality parameters of surface water (rivers and lakes), and groundwater. A sample table is given below: Water quality parameters of different

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd