Top answers

What is a buffer and what do you need to make one?

A buffer is a solution which resists changes in pH when alkaline or acidic solution is added to it. Buffers are created based on the equilibrium of a proton donor/ acceptor and the conjugate base/ acid. For ...
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Answered by Felix B. • Chemistry tutor
5359 Views

differentiate 2^x

y=2^x lny=xln2 y=e^(xln2)
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Answered by Mit P. • Maths tutor
6971 Views

How do I prepare for a speaking exam?

When you are preparing for a speaking exam it is beneficial to revise the subject area beforehand. Talk to your teacher/tutor and find out which topic/s you will be discussing. You could meet up with a frien...
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Answered by India S. • German tutor
3534 Views

When is it right to use 'lo', 'la' and 'le' in Spanish?

These are called object pronouns and they take a little practice. Though don't worry, object pronouns are basically just words that mean 'it' or 'him or her'. To break it down simply: 'Lo' = 'it' for masculi...
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Answered by Paul H. • Spanish tutor
466736 Views

How do I prepare for an exam with an unseen text?

I found this difficult at first, especially coming from GCSE where the book was there for you to constantly refer to. However, I found that the best way for me to remember quotations, was for me to relate th...
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6948 Views