Witherite is a mineral that contains barium carbonate and nonreactive material. If a 1.68 gram sample of witherite were to react completely with 24.6 mL of 0.2558 M HCl , what is the percent of barium carbonate in the sample? The balanced reaction is shown below. \( 1 \mathrm{BaCO}_{3}+2 \mathrm{HCl} \gg \mathrm{BaCl}_{2}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \) Use the variation: \( \%= \) (mass pure \( \left.\mathrm{BaCO}_{3}\right) / \) (mass witherite) \( \times 100 \)

Identify the reaction type for the reaction shown below: \( \mathrm{Cr}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}+\mathrm{H}_{2} \)

Identify the reaction type for the reaction shown below: \( \mathrm{Na}+\mathrm{Br}_{2} \rightarrow \mathrm{NaBr} \)

What is the molarity of the solution when 43.30 grams of NaBr is dissolved in 850.0 mL of water?

Identify the reaction type for the reaction shown below: \( \mathrm{NaHCO}_{3} \rightarrow \mathrm{NaCO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \)

Concentrated HCl is 12.0 M . Determine the volume in mL of the concentrated solution required to produce 5500 mL of 0.250 M HCl .