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24.3cm^3 of 0.02moldm-3 KMnO4 reacted with 20cm^3 of iron (II) solution. Calculate the molarity of the iron (II) solution.

Firstly calcuate the moles of KMnO4 by using the equation n=MV/1000 where n=moles M=molarity (moldm -3 ) and V= volume (cm 3 ). As the question gives the molarity and volume of KMnO4 you simply plug the valu...
AB
Answered by Anya B. • Chemistry tutor
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What is a buffer, and how does it respond to the addition of acid or alkali?

Firstly, I would try and establish with the tutee what a buffer is and define it. Going through the key aspects of what a buffer is. The standard definition I have for a buffer is 'A solution that minimises ...
TW
Answered by Tom W. • Chemistry tutor
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What factors affect acidity in solution?

Approach this question in a logical manner breaking it down into constituent parts and then explaining these in turn. Give a defination for acidity i.e. pH: pH=-log10[H+] or pKa=-long10Ka The question is con...
TR
Answered by Theo R. • Chemistry tutor
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2-chloropropanoic acid has a Ka of 1.48E-3. Write an expression for Ka and hence or otherwise, calculate the pH of a 0.35M solution of 2-chloropropanoic acid

In these multiple part questions, it is often the case that the previous part of the question will provide necessary information for answering the following parts, as hinted by the use of 'hence'. It's very ...
CM
Answered by Colin M. • Chemistry tutor
8605 Views

What is the electron arrangement for a Co atom?

Look up Co on the periodic table. Proton number is 27. Therefore, the number of electrons is 27. 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 3d 7 , 4s 2
EP
Answered by Emma P. • Chemistry tutor
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