Tartaric acid, H_2C_4H_4O_6, has two acidic hydrogens. The acid is often present in wines and precipitates from solution as the wine ages. A solution containing an unknown concentration of the acid is titrated with rm NaOH. It requires 23.65 mL of 0.3500 M rm NaOH solution to titrate both acidic protons in 60.00 mL of the tartaric acid solution. What is the balanced net ionic equation for the neutralization reaction?