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I am going to a lab next week on Acids, Bases, PH and Buffers, but i...

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Chemistry

I am going to a lab next week on Acids, Bases,PH and Buffers, but i need some help, especially onBuffers.

Q.5 Which solution(s) showed the greatest and which solutions(s)showed little or no change change in pH? Why? regarding which ones,i do understand that i need to do the lab first.

I understand bufferss resist a change in PH when a small amountof strong acid OR strong base is added to it. This means that thePH of the buffers does not change significantly (by more than 1 PHunit) when a small amount of strong acid or base its addedCan you please give me an example? i dont understand whensay (by more than 1 unit)

In contrast, unbuffered solutions will showsignificant PH changes ( greater than 1 PH unit) when a smallamounts of strong acid or base are added. Can you give anexample? i dont understand where it say (greaterthan 1 PH unit) i will appreciate your help.

Answer & Explanation Solved by verified expert
4.4 Ratings (1085 Votes)
Let us take a buffer of CH3CO2H andCH3CO2NaNow calculate pH of a solution prepared by mixing 1000 mL of010 M CH3CO2H Ka18 x 105with 2500 ml of 020 M CH3CO2Na And then addingcalculate change in pH when 2500 mLof 010 M NaOH is added to the bufferFirst we will determine number of moles or mmoles of the acidand conjugate base100 mL x 010 M 10 mmol CH3COOH2500 mL x 020 M 5    See Answer
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