Hydrochloric acid and sodium hydroxide yield salt and water H+ + Cl- + Na+ + OH- --> Na+ + Cl- + H2O
Comment:
In solutions you better leave unchanged ions ( Cl- and Na+) out of the balanced equation: called to be 'tribune ions' (people on the tribune don't take part in the 'match'):
H+ + OH- --> H2O This looks simpler than: H+ + Cl - + Na + + OH- --> Na + + Cl - + H2O
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Na+ and Cl- are spectator ions.
The balanced equation for this reaction is Fe2O3 + 3 H2O = 2 Fe(OH)3.
Calcium and water react to form calcium hydroxide and hydrogen. Ca + 2H2O --> Ca(OH)2 + H2
Ca(OH )2 plus sulfuric acid yields water and CaSO4.
Oh, dude, you're hitting me with the metric system! Alright, so there are 10 centiliters (cL) in a deciliter (dL). So, to convert 29 cL to dL, you just divide by 10. That gives you 2.9 dL. Easy peasy, right?