Question

what is molality and molarity​

Answer 1

Solution :-

$\underline{\boxed{\bf{\red{Molarity:}}}}$

▪ Symbol : M

▪ Definition : Number of moles of solute dissolved one litre of solution.

▪ Effect of temperature : Change with change in temperature.

▪ Formula :

$\underline{\boxed{\bf{\pink{Molarity=\dfrac{Moles\:of\:solute}{Volume\:of\:solution\:in\:L}}}}}$

$\underline{\boxed{\bf{\orange{Molality:}}}}$

▪ Symbol : m

▪ Definition : Number of moles of solute per 1kg of the solvent.

▪ Effect of temperature : No effect

▪ Formula :

$\underline{\boxed{\bf{\green{Molality=\dfrac{Moles\:of\:solute}{Mass\:of\:solvent\:in\:kg}}}}}$

Additional information :-

$\underline{\boxed{\bf{\blue{Parts\:per\:million:}}}}$

▪ Symbol : ppm

▪ Definition : Number of parts of solute present in million parts of solution.

▪ Effect of temperature : No effect

▪ Formula :

$\underline{\boxed{\bf{\gray{ppm=\dfrac{No.of\:parts\:of\:solute}{Total\:no.of\:parts\:of\:solution}\times 10^6}}}}$

Answer 2

Answer- The above question is from the chapter 'Some Basic Concepts of Chemistry'.

Question: What is molality and molarity?

Answer: MOLALITY-

Molality: It is the number of moles of solution in 1 kg of solvent.

Unit of Molality: Molal (m)

•When mass of solvent is in kilograms,

Molality = Moles of solute ÷ Mass of solvent in kilograms

•When mass of solvent is in grams,

Molality = Moles of solute × 1000 ÷ Mass of solvent in grams

MOLARITY:

Molarity: Number of moles of solute present in 1 litre of solution is called molarity.

Unit of Molarity = Molar (M)

•When volume is given in litres,

Molarity = Number of moles of solute ÷ Volume of solution in litres

•When volume is given in millilitres,

Molarity = (Number of moles of solute × 1000) ÷ Volume of solution in ml

•When mass % and density is given,

Molarity = (Mass % × Density × 10) ÷ Molar mass of Solute