Abottle of water has a label
saying 'suitable for chemical
analysis'. describe how this
water has been produced.
explain how you would check
to see if this water really is
suitable for analysis.

The said water is purified by means of either one of the processes like double distillation, reverse osmosis, deionization or more than one of them.

In chemical analysis of a chemical substance, the water used is needed to be free from any sort of chemical ions that are generally present in tap water. These ions if present may interfere in the chemical reactions in which water is used as a solvent, or can interfere with the values of estimation of a particular ion.

So the water is either distilled for two times to get rid of any types of ions dissolved in it. Or it can be purified by means of reverse osmosis through a semipermiable membrane. Or it can be deionized by means of using electrolysis at particular voltages. More than one processes can be done to get higher percentages of purification.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.