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How do buffers work?

What is a buffer? A buffer is a solution that resists a change in pH when small amounts of acid or base are added. It is composed of either a weak acid or a weak base with its respective salt. What's going o...
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Answered by Daisy D. • Chemistry tutor
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Calculate the percentage, by mass, of carbon in cyclohexane. Give your answer to two significant figures.

formua of cyclohexane C 6 H 12 molar ratio is 1:2 (divide 6 and 12 by 6 ) to get mass ratio multiply by molar mass (1 x 12 and 2x1) 12:2 convert to percentage (12/14 = 6/7 = 85.7% carbon by mass )
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Answered by Tom F. • Chemistry tutor
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You added 75cm^3 of 0.5moldm^-3 HCl to impure MgCO2, and some was left unreacted. The unreacted HCl reacted completely with 21.6cm^m of 0.5moldm^-3 NaOH. So what is the percentage purity of the MgCO3 sample?

MgCO 3 +2HCl --> MgCl 2 + H 2 O +CO 2 For this kind of question, I would always try to convert what I can into moles because that is the link between the solid (the grams of the MgCO 3 ) and the liquid (t...
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Answered by Febi S. • Chemistry tutor
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What is the effect of a catalyst in an equilibrium process?

A catalyst provides an alternative pathway for a reaction to take place and therefore helping the reaction to take place at a lower activation energy. In an equilibrium process, a catalyst has no effect on t...
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Answered by Rajenth N. • Chemistry tutor
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What are covalent bonds?

Covalent bonds are a type of chemical bond formed by a shared pair of electrons between atoms. Covalent bonds tend to occur between non-metal type atoms (metals tend to form ionic bonds which are formed by a...
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Answered by Aneesh S. • Chemistry tutor
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