Question

Re-write the chemical reaction for both saturated sodium chloride and saturated barium chromate solutions. You may refer to the experimental procedure.

NaCl (s) Û Na⁺ (aq) + Cl^- (aq)

BaCrO₄ (s) Û Ba²⁺ (aq) + CrO₄^2- (aq)

A completed data table #4.

Change to reaction	Drops added	Visual Observation	Shift in Reaction
NaCl + Concentrated HCl	3	The solution started as a clear solution, however after the concentrated HCl was added the solution turned into a cloudy white solution. What looks like white precipitates were visible at the bottom of the test tube. No endothermic or exothermic reaction was observed.
BaCl2 + K2CrO4	3	The solution started out as a completely clear solution. After the reaction, the solution presented as a yellow solution that also appeared cloudy. The solution also seemed to look thicker than before, it was no longer transparent due to the cloudly presentation (almost like yellow milk). No endothermic or exothermic reaction was observed.
BaCl2 + K2CrO4 + 6M Hcl	12	The solution went from the yellow, to a transparent solution. The color could be observed as a yellow/orange color. A white precipitate was seen at first, floating in the test tube. However, after the test tube was mixed together the white precipitate was no longer seen. No endothermic or exothermic reaction was observed.

Using equation 6, interpret your observations in terms of Le Châtelier’s principle when you added concentrated hydrochloric acid to the sodium chloride solution.

Need the shift in reaction, and the new interpreation.

The equation 6, is the equation listed above.

Answer 1