Carbonated beverage (soda)/other physicochemical component detection

Carbonic acid is a binary weak acid with the chemical formula H2CO3 and a very small ionization constant. At room temperature and pressure, the concentration of carbon dioxide saturated solution is about 0.033mol/L, with a pH of 5.6, pKa1=6.37, and pKa2=10.32. The physical properties of carbonate are extremely low in acidity, and its saturated aqueous solution has a pH of about 5.6. Its aqueous solution appears acidic and can cause the indicator to change color (which can turn the litmus solution red). The chemical property structure formula: HO CO OH forms when CO ₂ is dissolved in water. Pure carbonic acid in the presence of C (OH) 4 is an unstable crystal that decomposes violently when exposed to water. Carbonic acid is a binary acid that undergoes two steps of ionization: H ₂ CO Å ⇌ HCO Å -+H+; Ka1=4.2 × 10-7 mol/L; PKa1=6.38 (25 ° C) HCO3- ⇌ CO32-+H+; Ka2=5.61 × 10-11 mol/L; PKa2=10.25 (25 ° C) It should be noted that the above values are not applicable to the actual estimation of the acidity of carbonic acid, as the acidity of individual carbonic acid molecules is stronger than that of both acetic acid and formic acid. In fact, carbonate molecules only appear in the dynamic equilibrium between carbon dioxide and water, and their concentration is much lower than carbon dioxide, so their acidity is actually lower

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