If 50.0 ml of a 1.00 m hcl solution and 45.0 ml of a 1.00 m naoh solution are combined, which reagent is limiting?

The answer to this question would be: NaOH solution 

Limiting reagent is the reagent that totally consumed in the reaction. To answer this question you need to know the equation for the chemical reaction. The equation would be:
HCl + NAOH = H2O + NACl

All of the coefficient in the reaction is 1, which mean 1 HCl will react to 1 NaOH. In this question, the concentration of HCl and NaOH is same so the amount of the molecule can be reflected by the volume. NaOH has lower volume compared to HCl so it is clear that NaOH will be totally consumed in this reaction. 

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