The question is at the end (only one question appreciate the help) add a few dro

Question

The question is at the end (only one question appreciate the help)

add a few drops of 6 M HCl to one of these test tubes. Record your observations. When 6 M HCl is added to one of the test tubes the solution dissolves and becomes a very dark yellow.

. 2 BaCrO4(s) + 2 H+(aq) --> 2 Ba2+(aq) + Cr2O72-(aq) + H2O(l)

What observations support that this is the reaction that is occurring? The observations that support that this reaction is occurring is the color change from a light color yellow to a dark yellow color. Also, the breaking up or the “dissolution” of the BaCrO4 solid is showing the reaction is happening.

To a second test tube containing BaCl2 and K2CrO4, add a few drops of sulfuric acid, H2SO4. Record your observations. The solution becomes a brighter and darker yellow and cloudy.

How did your observations for adding sulfuric acid differs from adding hydrochloric acid.

Explanation / Answer

Dissociation of BaCrO4 depends amount of acidity. when few drop of H2SO4 is added it just sufficient to react BaCl2 and K2CrO4 and fromed BaCrO4 yellow precipitation comes. Higher pH (6 M HCl) BaCrO4 dissociate and yellow Cr2O72 was fromed

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