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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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In both ‘Poem for My Sister’ and ‘To a Daughter Leaving Home’ the speakers describe feelings about watching someone they love grow up. What are the similarities and/or differences between the ways the poets present those feelings?

https://filestore.aqa.org.uk/resources/english/AQA-87022-SQP.PDF - the sample paper where both poems can be found. In both ‘To a Daughter Leaving Home’ and ‘Poem for My Sister’, the poets express fear and an...
NM
Answered by Niamh M. • English tutor
38307 Views

2 log(x + a) = log(16a^6) where a is a positive constant. How do I find x in terms of a?

The left hand side of the equation can be rewritten as log(x+a)^2, using the power rule for logs. We can then simplify log(x+a)^2=log(16a^6) to (x+a)^2=16a^6. Taking the square root of both sides, we find x+...
EV
Answered by Emily V. • Maths tutor
15605 Views

How do I solve quadratic equation by completing the square : X^2 - 4X = 5

We have X 2 - 4X = 5, write the expression on the left side as X 2 - 2•2X = 5. Then we would need extra term 4 to complete the square, so adding 4 on the both sides gives us, X 2 - 2•2X + 4 = 5 +4. Simplify ...
RK
Answered by Rabin K. • Maths tutor
4368 Views

How should I approach the critical essay? (Higher)

The key to this portion of the paper is to know your studied texts in depth. This is not to say that you should be able to recite 200 different lines from Anthony and Cleopatra. It is a case of understanding...
TD
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