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Observation and conclusion: When we add a pinch of baking soda (sodium hydrogen carbonate) to vinegar or lemon juice, bubbles of carbon dioxide gas are produced with a fizzing sound. When we pass this gas to lime water, it turns milky. Thus, in this process, new substances are formed, it is a chemical change.
Vinegar + Baking soda $\rightarrow$ Carbon dioxide + Other substances
Vinegar + Baking soda $\rightarrow$ Carbon dioxide + Other substances
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