Top answers

What are the differences between the effects of a catalyst vs reactant concentration on the position of equilibrium/ why?

An increased concentration of reactant will shift equilibrium to the right, because the reactants will react to form more product in order to decrease concentration again. However, while a catalyst will incr...
PS
Answered by Pryanka S. • Chemistry tutor
2236 Views

Why can you separate crude oil using distillation?

Different substances (fractions) can be separated as they have slightly different boiling points. Different hydrocarbons condense at different sections of the fractionating column, which is very hot at the b...
LW
Answered by Lydia W. • Chemistry tutor
3419 Views

How does a fractional distillation tower work?

The crude oil, which is composed of a mixture of different hydrocarbons, is heated in the bottom of the tower, so that hydrocarbons with lower boiling points boil off first. The tower gets gradually colder a...
DK
Answered by David K. • Chemistry tutor
5092 Views

The acid dissociation constant, Ka, of ethanoic acid is 1.78 x 10^-5 at 298K. Given that the concentration of a sample of ethanoic acid is 0.4moldm^-3, calculate its pH at 298K.

Using the acid dissociation equation, Ka = [H+][A-]/[HA]. (where Substitute the known values into the concentration to give 1.78x10 -5 = [H+][A-]/0.4 . Because the acid is dissociating in solution the acid d...
SR
Answered by Sita R. • Chemistry tutor
14792 Views

A Solution of NaOH had a concentration of 40g/dm3. What mass of NaOH would there be in 250cm3 of the solution?

The two volumes in this question are in different units, so first we need to get both our volumes on the same page. remember 10cm = 1dm so 1000cm 3 = 1dm 3 (10 3 cm 3 = 1 3 dm 3 )So now the question is &quot...
EH
Answered by Eme H. • Chemistry tutor
12343 Views