A colour change from red to yellow represents acidic concentrations of carbon dioxide when using hydrogencarbonate indicator.
Un cambio de color de rojo a amarillo representa concentraciones ácidas de dióxido de carbono cuando se usa indicador de hidrogenocarbonato.
| Front | What colour change represents acidic concentrations of carbon dioxide when using hydrogencarbonate indicator? |
|---|---|
| Back | Red to yellow. |
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