A sample of $25.0\,\text{cm}^3$ of $1.0\,\text{mol dm}^{-3}$ sodium hydroxide is titrated using dilute sulfuric acid and a suitable indicator. Reaching the end-point needs $25.0\,\text{cm}^3$ of the acid. What is the concentration of the sulfuric acid and which indicator is used?
- A$0.5\,\text{mol dm}^{-3}$, methyl orange
- B$0.5\,\text{mol dm}^{-3}$, universal indicator
- C$2.0\,\text{mol dm}^{-3}$, methyl orange
- D$2.0\,\text{mol dm}^{-3}$, universal indicator