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Sodium hydrogen carbonate were disolved in 10cm cubed of water in a boiling tube . Lemon juice was then added dropwise with shaking until there was no further observable change. Explain the observation which was made in the boiling tube when the reaction was in progress.

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The observation is the evolution of carbon dioxide gas.

Acid-base reaction

Sodium hydrogen carbonate is a base while lemon juice contains an acid known as citric acid.

Thus, the reaction in the illustration is involving an acid and a base.

Sodium hydrogen carbonate goes by the formula: NaHCO₃

Citric acid goes by the formula: C₆H₈O₇

The reaction between the two goes thus:

[tex]3 NaHCO_3 + C_6H_8O_7 --- > 3 H_2O + 3 CO_2 + Na_3C_6H_5O_7[/tex]

The carbon dioxide gas is evolved from the reaction vessel in the form of bubbles.

More on chemical reactions can be found here: https://brainly.com/question/22817140

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