moles, mass, mr, c, v

Question 1

how to find mr of a molecule from its mass only

Answer 1

x avogadro
(to convert to g/mol and therefore it is the mr)

Question 2

describe how to prepare standard solution (titration)

Answer 2

1. Dissolve weighed sample in small volume of distilled water (in a beaker)
2. Transfer to a 250cm^3 volumetric flask
3. Rinse beaker and add washings to flask
4. Make up to graduation mark
5. Use a dropping pipette so base of meniscus on mark
6. Put a stopper on the volumetric flask
7. Invert several times to mix