A 42.0 mL sample of an NaOH solution is placed in a flask with a few drops of phenolphthalein (indicator). If 11.7 mL of a 0.325 M HCl solution is needed to reach the endpoint, what is the molarity of the NaOH solution? NaOH(aq) + HCl(aq) H2O(l) + NaCl(aq)

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Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

Answer is: hydrogen is being oxidized.chemical reaction: co₂ + h₂ → co + h₂o.oxidation half reaction: h₂ → 2h⁺ + 2e⁻.reduction half reaction: c⁺⁴ + 2e⁻ → c⁺².oxidation is increase of oxidation number, hydrogen change oxidation number from neutral charge (in molecule of hydrogen) to oxidation number +1 (in water).