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A solution of ethanoic acid in water has a concentration of 3 g/dm^3. Given that the pKa of ethanoic acid is 4.76, calculate the pH of this solution.

Key facts to be noted by student: Molar mass of ethanoic acid = 60 g/mol. pK a = -log(K a ) pH =-log([H + ]) Concentration of acid solution = 3/60 = 0.05 moldm - 3 k a = [H + ] 2 / [CH 3 COOH] therefore [H +...
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Answered by Tim C. • Chemistry tutor
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mRNA is used in translation to make polypeptides. Describe the process of how mRNA (Messenger RNA) is produced in the Nucleus.

Helicase unwinds the DNA double helix strucutre This is done by breaking the hydrogen bonds Only one strand is then used as a template RNA nucleotides bond/ attract to exposed bases This is according with co...
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Answered by Sophia B. • Biology tutor
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What is resonance

Resonance is the effect of an external driving force which causes a system to ocsillate with a greater amplitude at certain frequencies. All objects have a natural frequency, and this specific property deter...
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Answered by Michalis C. • Physics tutor
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How do I talk about symbolism in my exam?

If you are analysing a text such as 'The Great Gatsby' or 'Jane Eyre', it might be useful in your essay to speak about symbols in either text. This can be done in a variety of ways, but it is better for you ...
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Explain what is meant by locus of control (4 marks)

Locus of control refers to the extent someone believes they have personal control over events in their lives, such as personal successes and failures. Locus of control is typically measured along a bi-polar ...
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Answered by Helen B. • Psychology tutor
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