炭たん酸さん水すい素そ塩えんたんさんすいそえんMeanings1nounhydrogencarbonate; bicarbonatechemistryChemistry term for a salt containing the hydrogencarbonate ion (HCO₃⁻).炭たん酸さん水すい素そ塩えんは、水みずに溶とけると弱じゃくアルカリ性せいを示しめす。Hydrogencarbonates show weak alkalinity when dissolved in water.