100cm3 kwasu solnego o Cm 0,02 mol/dm3 zobojętniono roztworem wodorotlenku baru o Cp=2% Oblicz masę roztworu Ba(OH)2 zużytego do zobojętnienia Daje naj.
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2 HCl + Ba(OH)2 ---> BaCl2 + 2 H2O
0,02 mol HCl --- 1000 cm3
x --- 100 cm3
-----------------------------------
x ---> 0,002 mol HCl
2 mol HCl --- 1 mol Ba(OH)2
0,002 mol HCl --- x
------------------------------------
x ---> 0,001 mol Ba(OH)2
1 mol Ba(OH)2 --- 171g
0,001 mol Ba(OH)2 --- x
--------------------------------
x ---> 0,171g Ba(OH)2
100g --- 2g
x --- 0,171g Ba(OH)2
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x ---> 8,55g Ba(OH)2