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If red litmus paper changes to purple, then we call it a acidic solution.
\(2CaSO_4.2H_2O \xrightarrow {373K}(CaSO_4)_2.H_2O + 3H_2O\)
\(NaHCO_3 + HCl \rightarrow NaCl + 2H_O + CO_2\)
Red litmus has no effect in basic solution.
Answer:
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