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M NaOH = 40g/mol
na zobojętnienie 1 mola NaOH zgonie z równaniem potrzeba 0,5 mola kwasu
40g NaOH------ 0,5 mola kwasu
10g NaOH ------ x moli
x = 0,125 mola
4 mole kwasu ----- 1000 cm3 roztworu
0,125 mola kwasu --- x
x = 31,25 cm3