[biomaterials_2010]

Hi guys, I am new to the forum and really need some help with my University Project. I have madeup 35% by mass aqueous solution of Polyacrylic acid (PAA) to distilled water. I weighed out 0.52g PAA and to calculate the amount of distilled water I needed at
(35% m/m). 0.52/35*100=1.486

1.486-0.52= 0.966 g of distilled water


Now this is the part where I'm confused. I have some Tartaric acid (powder form), says 99.7% on the bottle assuming thats the concentration (not sure of the relevance). How would I go about adding 5% by mass Tartaric acid to the PAA soultion above.

[biomaterials_2010]

Forgot to mention by adjusting the concentration im looking to obtain 40% total solids i.e 35% PAA/ 5% Tartaric acid

[Borek]

So do your calculations for 40% of solids, then split solid mass so that it is 35:5.