amount of NaOH in mol for every point: (0.76/100)/(2/№point)= 0.0038; 0.0076; 0.0114; 0.0152; 0.019; 0.0228
amount of NaOH in mL for every point: n/0.000320= 11.875; 23.75; 35.63; 47.5; 59.38; 71.25
pH for every point: pH=-lg(CH3AK1+CH2A+K2+CHAK3)1/2
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