Suppose that you are given four test tubes, labeled A. B. C. and D each containi

Question

Suppose that you are given four test tubes, labeled A. B. C. and D each containing a colorless solution. In each of the following questions, indicate which of the solutions included in this experiment could be used to distinguish between the pairs of solutions Use the information in the table on the previous page to help you make a choice, in each case, describe the observations you would make and write a net ionic equation for any reaction that would occur. Test Tube A contains 0.1 M NaNO_3 solution, and Test Tube B contains 0.1 M Ba(NO_3)_2, solution A student was given live known solutions and asked to study their interactions The solutions were 0 1M Na_2SO_4.0.1M NaCI. 0.1 M Ba(NO_3)_2. 0.5M HCl. and0 3 M Na_2CO_3 To determine the behavior of these solutions, the student mixed them systematically in pairs. Ba(NO_3)_2, solution with NaCl solution, then Ba(NO_3)_2 solution with HCl solution, and so on. As an aid in selecting the two solutions to be mixed each time and in recording the corresponding observations the student used the grid shown below Based on your laboratory results and the table on the previous page. fill in the grid. indicating the observations the student made when each pair of solutions was mixed. Use "N.R' to indicate no reaction. *ppt* for precipitate, and 'gas' for a released gas. solutions NaCI HCl Na_2CO_3 Na_2SO_4 Ba(NO_3)_2 Ba(NO_3)_2 na_2so_4 Na_2CO_3 HCl NaCl Test Tube C contains 0.1M NaCI solution and Test Tube D contains O.5 M HCl. The student was then given the same set of five solutions, but this time in test tubes labeled A.B.C. D. and E When these solutions were mixed, the student recorded the following observations.

Explanation / Answer

Answer for 1. (1):

Pair of solutions: (A). 0.1 M NaNO3; (B). Ba(NO3)2

They can be distinguished by reacting with 0.1M Na2SO4.

Reaction of Ba(NO3)2 with Na2SO4 gives a white BaSO4 as shown below.

Ba(NO3)2 (aq) + Na2SO4 (aq)  --------------------------> BaSO4 (s) + 2 NaNO3 (aq)

No reaction will occur when Na2SO4 reacts with NaNO3

Answer for 1. (2):

Pair of solutions: (C). 0.1 M NaCl; (D). HCl

They can be distinguished by reacting with 0.1M Na2CO3.

Reaction of Na2CO3 with HCl gives CO2 gas as shown below.

Na2CO3 (aq)  + 2HCl (aq)   --------------------------------> 2 NaCl (aq) + CO2 (gas) + H2O

No reaction will occur when Na2CO3 reacts with NaCl solution.

Answer for 2.(1)

Answer for 2.(2)

Solutions NaCl HCl Na2CO3 Na2SO4 Ba(NO3)2 Ba(NO3)2 N.R N.R PPT PPT N.R Na2SO4 N.R N.R N.R N.R PPT Na2CO3 N.R GAS N.R N.R PPT HCl N.R N.R GAS N.R N.R NaCl N.R N.R N.R N.R N.R

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