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Which equation is unbalanced? #HCl(aq)+H_2O(l)rarr Cu^(2+) + 2NO_3^-#; #Ca(OH)_2(s) stackrel(H_2O)rarr Ca^(2+) +2HO^-#; #Ca(NO_3)_2(s) stackrel(H_2O)rarr Ca^(2+) +2NO_3^-# ;#NH_3(aq) +H_2O(l) rightleftharpoonsNH_4^+ + HO^-#;

Answer 1

Natalie Anton

Well you tell us. Which one does NOT conserve mass and charge.....?

#HCl(aq)+H_2O(l)rarr Cu^(2+) + 2NO_3^-#

#Ca(OH)_2(s) stackrel(H_2O)rarr Ca^(2+) +2HO^-#

#Ca(NO_3)_2(s) stackrel(H_2O)rarr Ca^(2+) +2NO_3^-#

#NH_3(aq) +H_2O(l) rightleftharpoonsNH_4^+ + HO^-#

Furthermore, one of these items differs from the others.

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Answer 2

Natalie Anton

The equation that is unbalanced is: Ca(OH)_2(s) + H_2O(l) → Ca^(2+) + 2HO^-.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.