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How to Balance:

Word equation: Sodium carbonate + Hydrochloric acid → Sodium chloride + Carbonic acid

Type of Chemical Reaction: For this reaction we have a double replacement reaction.

Balancing Strategies: In this reaction the Na and H atoms switch places. Therefore we have a double replacement (displacement) reaction.

You may want to start by changing the coefficient in front of the HCl.

For a complete explanation, watch:

When balancing chemical equations our goal is to have the same number of each type of atom on both sides of the equation.

Only change the coefficients (these are the numbers in front substances).
Never change the subscripts (the small numbers after elements).