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0,2 mole NaOH-----1000cm3 roztworu
xmoli NaOH----------50cm3 roztworu
x=0,01mola
mNaOH=23u+16u+1u=40u
40g NaOH------1mol
xg NaOH-------0,01mola
x=0,4g NaOH
Należy użyć 0,4g NaOH (wodorotlenku sodu)