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QUESTION

# Is this equation right HCl + NaOH ---&gt; H2O + NaCl or NaOH+HCl--&gt; NaCl + H2O &amp; what the difference ?

Either of the equations in your question is acceptable, although traditionally the acid comes first in the reactants and the salt comes first in the products. "HCl(aq)+NaOH(aq)"rarr"NaCl(aq)+H"_2"O(l)"

This is a type of double replacement (displacement) reaction called a reaction. The positive ions "H"^+ and "Na"^+ have switched places with the negative ions "Cl"^- and "OH"^-. The result is the formation of water and a salt.