uiz contains seven questions. As with other Post-lab quizzes the time limit is 4

Question

uiz contains seven questions. As with other Post-lab quizzes the time limit is 45 minutes. Once you have answe stion you will not be able to go back to the question later Question 9 1 pts Which of the following would be the most convincing explanation for identifying an unknown solution as containing CaBr2? 0 when mixed with unknown x, this solution formed a precipitate. O The solution was not an acid. When mixed with unknown X, this solution formed a precipitate. When mixed with unknown Y, there was no visible reaction. O t was the last solution, so by process of elimination it must be CaBra O The solution was pH neutral as expected from a Caßr) solution, It had no reaction with acids, but did form a precipitate with a neutral solution (possibly forming PbBro as PbINOJ)h was an unknown) Quiz saved at 6:04pm Submit Quiz

Explanation / Answer

Answer is (d) The solution was pH neutral because CaBr2 is a salt of strong acid and strong base. So no effect of addition of acid or base. But it is true that it forms precipitates with neutral solution like Pb(NO3). The reaction are as followes.

Pb(NO3)2(aq) + CaBr2(aq) ===> PbBr2(s) + Ca(NO3)2(aq)

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