Mole and avogrado's constant

student identified use of the burette as a largest source of uncertainty

suggest how the procedure could be improved to reduce percentage uncertainty

Use a larger mass of solid

so a larger titre will be needed

student required to make up 250cm3 of an aqueous solution that contains known mass of MHCO3. provided with sample bottle containing MHCO3

describe a method, including apparatus and practical details, that the student should use to prepare the solution

weigh the sample boat containing the solid on a 2dp balance

transfer the beaker and reweigh the sample bottle

record the difference in mass

add distilled/ deionised water

stir with a glass rod

until all solid has dissolved

transfer to volumetric flask (250cm3)

with washings of distilled water

mark with water up to 250cm3

agitate the mixture

by shaking inverting it so it mixes

type of reaction occurs when calcium carbonate reacts with nitric acid

Neutralisation

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