When yellow \(\mathrm{BaCrO}_{4}\) is dissolved in \(\mathrm{HCl}(\mathrm{aq}),\) a green solution is obtained. Write a chemical equation to account for the color change.

Short Answer

Expert verified
The balanced chemical equation that accounts for the color change when BaCrO4 is dissolved in HCl is 2HCl(aq) + BaCrO4(aq) -> BaCl2(aq) + CrCl3(aq) + H2O

Step by step solution

01

Identify initial chemicals

Initially, there are two chemicals present, BaCrO4 (which is yellow) and HCl. The arrow in the chemical equation will indicate that a reaction is taking place.
02

Determine the product(s)

The chromium in BaCrO4 gets reduced by HCl, changing its oxidation state and, as a result, its color. The resulting compound is CrCl3, which is green. The remaining compound is BaCl2.
03

Balance the chemical equation

For the chemical equation to be consistent with the law of conservation of mass, we need to ensure that there are equal numbers of each type of atom on both the left and right sides of the equation. The balanced equation is:2HCl(aq) + BaCrO4(aq) -> BaCl2(aq) + CrCl3(aq) + H2O

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