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

The total number of unpaired electrons & atoms of element, The total numbe...

The total number of unpaired electrons in d- orbital's of atoms of element of atomic number 29 is: (1) 10         (2) 1        (3) 0     (4)5 Ans:   0

The reversible hydration of carbon dioxide, The reversible hydration of car...

The reversible hydration of carbon dioxide The reversible hydration of carbon dioxide to carbonic acid is an acid-catalyzed addition of water that is mechanistically identical

Functions of nucleic acid - biomolecules, Functions of nucleic acid: N...

Functions of nucleic acid: Nucleic acid has two major functions (a) Replication and (b) Protein synthesis.

Which of the following are isoelectronic species, Which of the following ar...

Which of the following are isoelectronic species                  I= CH + 3 , II-NH 2 , III- NH + 4 , IV-NH 3 (1) I, II, III              (2) II, III, IV  (3) I, II

Stoichiometry, How many moles of copper will be produced from 2.00 moles of...

How many moles of copper will be produced from 2.00 moles of aluminum?

Atom, if the electon in hydrogen atom is exited to n=5 the number of diffre...

if the electon in hydrogen atom is exited to n=5 the number of diffrent frequency of radiations which may be exited is

The correct sequence of increasing covalent, The correct sequence of increa...

The correct sequence of increasing covalent character is represented by: (1) LiCl 2                            (2)  BaCl 2 (3)  NaCl 2

The shape of dxy orbital will be, The shape of d xy orbital will be: (...

The shape of d xy orbital will be: (1) Circular (2) Dumb-bell (3)Double dumb-bell (4) Trigonal Ans: Double dumb-bell

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