You, a researcher, are adding a substance labeled A into another container that

ID: 1001760 • Letter: Y

Question

You, a researcher, are adding a substance labeled A into another container that has an aqueous solution (labeled B)?

You note that with the addition of 50 g of A there is no change in the PH of solution B.

When this process is repeated with 500 g of A added to the solution labeled B the PH rises to level of 11.

Your associates provide the following alternative hypotheses about the outcome of this experiment!

Which would you be most confident in concluding? 2) Which of the following represent a hypothesis you could support? 3) Why/ Why Not?

To solve the problem below, you must write a clear and convincing justification for accepting the of the possible answer choices as the best or most appropriate and for rejecting each of the other choices as less appropriate. Your reasons for rejecting choices are just as important as your reasons for choosing the best answer.

Solution B was basic before and substance A has added hydroxide ions to this solution.

Solution B was acidic before and substance A has removed hydrogen ions from this solution.

Solution B has a buffer ( system) present that initially resisted the change of PH by releasing hydrogen ions into solution.

Solution B has had its buffering system overwhelmed by the addition of hydrogen ions from an acid (substance A) that was added.

Explanation / Answer

The reasons A and B are less likely due to that if solution b were basic o acidic the PH would have changed with the adding of the first 50 g of solution a.

The C and D reasons has more sense because Buffers are those solutions whose proton concentration hardly changes by adding strong acids or bases .In other words, have the property to keep the pH of a solution versus the addition of relatively small amounts of acids or bases powerful.

Now, as that amount of solution added to the buffer is every time greater, the pH begins to denote small changes that can then be more significant as stated in reason D ( most confident in concluding).

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