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Why does the pH of neutral water drop when it is left out in an uncovered container on a worktop for a long period of time?

This question tests your knowledge on; the properties of non-metal oxides in solution, the concept of equilibrium, pH. Non-metal oxides such as (CO2, P4O10, SO2, etc) are acidic in solution. When left out on...
NG
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What is the electronic configuration of Chlorine and of a chloride ion and explain why Chlorine is 'happiest' as a chloride ion.

Cl - 1s22s22p63s23p5 Cl- - 1s22s22p63s23p6 The 3p orbital is slightly unstable because of the single unpaired electron which is at a higher energy and wants to pair up, the 3p orbital is more stable when the...
MS
Answered by Molly S. • Chemistry tutor
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Explain why a buffer solution is formed when excess weak acid is added to a strong base

Because the weak acid is in excess, all of the strong base will react to form water and a salt of the acid. Since there is still some of the acid in the reaction mixture at the end point, an acidic buffer is...
RK
Answered by Ryan K. • Chemistry tutor
18718 Views

Describe briefly how you would show that manganese(II) ions catalyse the reaction between manganate(VII) ions and ethanedioate ions, in dilute sulphuric acid.

Mix the reagents and record the time taken for a specific observation, e.g. disappearance of colour which is characteristic for this chemical reaction. We repeat this step and add more manganese(II) ions; a ...
SS
7242 Views

Relationship between moles and Avogadro's constant

Moles equation is moles= mass/RFM Avogadro's constant is 6.x 10 23 . 1 mole means 6x 10 23 atoms/molecules. e.g. 2 mole of Cu weighs 128g. What is the weight of 1 Cu atom? 2 moles is 2x 6x10 23 atoms = 1.2x1...
JJ
Answered by Joshny J. • Chemistry tutor
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