Question

How to prepare in a beaker 100 ml, 50 ml of a solution of PVA 5% w / w with ethanol.

Answer 1

solution.cis. 100 ml = Total volume of solution. Result we should get = 5% w/w PVA with ethanol. density of ethanol 0.798 emmel. density of PVA (Poly Vinly alcohol) = 1.19 gmind. 5 % w/w means the there is 5 gm of PVA U in 100 gm of solution, but we have given total volume , therefore. mass densitix volune. → let a mul of PVA is present in total voluence therefore Halmass of Election fox 1.19)+ Cloo-21)*0.798 ( Total volunca loved) xw - Mass percent. luti mass of solution → Bex 1:19 Orchag) + CooWx00798 too 23.8x= 1.198+79.6-0.7962 79.8+ 0.392x (23.8 -0.392) = 7908 x= 796 = 3.409 nel 23.403 7 by adding 3.409 all of PVA in 96.591 mlof ethand we can get a solution of 5% w/w of PVAL ②. for 50 ml solution

the theory is same let you is presentin the solutio. 8 = 1 4 x 1.19 x 20. - Tyxlo191850-y)x0.798, 23084 = a 23aby = 39440.3927 1.194 -0.79 byt 39.9. 39.9 23.408 y 1.70 45 ml . By adding 17045 ml of PVA in 48.2955 ml of Ethanol we can get of solution of PVA having 5% Whet. & 2 D 2

I have assumed PVA in liquid form while answering the above question.