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200gNaOH
C NaOH=40%
---------------------
msH3PO4

C H3PO4=60%

Răspuns :

Roberteladrianpb6zy7

ms = 200 g , c% = 40%

stim ca c% = mdx100/ms

=> md = msxc/100 = 200x40/100 = 80 g NaOH

80 g           md

3NaOH + H3PO4 => Na3PO4 + 3H2O

3x40         98

=> md = 98x80/3x40 = 65,33 g H3PO4

=> ms(H3PO4) = 65,33x100/60

= 108,88 g sol. H3PO4

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