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How does pH relate to pKa?

pH measures the concentration of H + (protons) in an aqueous solution. pK a measures the ability for an acid to dissociate in an aquesous solution. Their relationship can be described my the Henderson-hassel...
CW
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What are the reagents used to oxidise an alcohol to a carboxylic acid.

Answer: Sulphuric acid and potassium dichromate.
JA
Answered by John A. • Chemistry tutor
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What is the pH of a 25 ml sample of 0.2 M sulfuric acid? What is the pH after 5 ml of 0.25 M sodium hydroxide is added?

H 2 SO 4 fully dissociates into ions (strong acid). It is diprotic therefore concentration of H + ions is twice that of the acid = 0.4 M. pH = -log[H + ] = -log[0.4] = 0.3979... = 0.40 to 2 d.pOH - ions reac...
GR
Answered by George R. • Chemistry tutor
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Explain why the boiling point of PH3 is lower than the boiling point of AsH3

AsH3 is a larger molecule than PH 3 as As is lower down the periodic table, so has a higher atomic number so more electrons. Therefore AsH 3 has more electrons than PH 3 meaning that the instantaneous dipole...
FO
Answered by Freya O. • Chemistry tutor
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Explain why Carbon Dioxide has a linear shape with a bond angle of 180 degrees

Carbon Dioxide consists of 1 carbon atom covalently bonded to two oxygen atoms.Carbon is in group 4 and so has 4 electrons in its outer shell.Carbon shares two pairs of electrons with each of the oxygen atom...
RP
Answered by Richard P. • Chemistry tutor
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