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Calculate the pH of 0.1M Benzoic Acid (C6H5COOH). Ka = 6.3x10-5 M

Ka = [H + ][B - ]/[HB]Benzoic acid dissociates to C6H6COO - and H + - this is a 1:1 ratio so the concentrations are equal hence [H + ][B - ] = [H + ] 2 6.3x10-5 = [H + ] 2 /0.16.3x10-6 = [H + ] 2 therefore H...
MB
Answered by Michael B. • Chemistry tutor
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ABC is a triangle with sides of length AB, 12m and BC,14m. Angle ACB = 43 degrees. Find the area of the triangle.

Use of the Sine Rule to ultimately work out the area of a triangleA/SinA = B/SinB14/Sin43 = 12/SinX14SinX = 12Sin43SinX = 12Sin43/14X=InverseSin(12Sin43/14) = 35.77-There are 180 degrees in triangle. Therefo...
EC
Answered by Eoin C. • Maths tutor
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Explain the effect of increasing concentraion of O2 on the equilibrium position of this gas phase reaction and what you might see given that Nitrogen Oxide and Nitrogen Dioxide appear colourless and brown respectively. NO + 0.5O2 ----> NO2

Using "Le Chatelier's principle", the equilbrium will seek to oppose the change made to the reaction. In order to counter the increase in oxygen concentration, the reaction will shift to the right ...
AB
Answered by Amman B. • Chemistry tutor
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Using the substitution method, solve the following simultaneous equations 2y+3x=14 and 6x-y=8

Equation 1: 2y+3x=14 Equation 2: 6x-y=8 Rearrange Equation 2: y=6x-8 therefore 2y=12x-16 Substituting the rearranged equation 2 into equation 1: 12x-16+3x=14 15x-16=14 15x=30 x=2 Substituting x into equation...
AW
Answered by Alex W. • Maths tutor
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'Gothic writing is characterised by a fascination with death.' Consider how far you agree with this statement by comparing Dracula with at least one other text prescribed for this topic.

I would always advise to plan before writing the essay to outline what you want to say and how you're going to structure it so that you remain focused on the question when writing. This plan does not need to...
Answered by • English Literature tutor
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