Question

what happen when dilute HCL is added tosolid sodium carbonate

Answer 1

here is your answer
both metal carbonates and bicarbonates get readily decomposed by mineral acids by evolution of carbondioxide bubbles .when hydrocloric acid is added to sodium carbonate, brisk effervescence of CO2 occurs along with the formation of sodium chloride and water.
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Answer 2

When dilute HCL is added to solid sodium carbonate neutralization reaction occurs and as a product salt(NaCl), CO2 gas and H2O is produced

the reaction between sodium carbonate and hydrochloric acid is shown below again: NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l)