Solutions Question

[pat]

"A 100mL solution containing 1M sodium acetate was made. The pH was than adjusted to 5.5. A similar solution containing NaCl was also made and treated similarly. Then 1mL of 1M NaOH was added to both solutions. Qualitatively (no numbers/calculations are necessary) explain what if any difference in the change in pH occurs between the two solutions. If the pH changes in the two solutions are different, explain why. For both solutions, explain (draw) what is happening to all of the chemical entities (e.g molecules) in the solution with the NaOH?"----Any help would be great!!

[Greippi]

Well, defining pH would be a good start to getting you on the right track. What is pH a measure of?...although mr wombel's done that for you.

Edited May 4, 2010 by Greippi

[toastywombel]

Well, defining pH would be a good start to getting you on the right track. What is pH a measure of?

 

pH stands for potential for hydrogen ion concentration. The scale is used to measure acidity vs alkaline substances. It ranges from 0-14, with acidic compounds/ substances such as HCl having a pH close to zero, while alkaline compounds/substances such as bleach having a pH close to 14.

 

The mathematical formula to derive pH of a given substance is

 

where aH is the (dimensionless) activity of hydrogen ions. The reason for this definition is that aH is a property of a single ion, which can only be measured experimentally by means of an ion-selective electrode which responds, according to the Nernst equation, to hydrogen ion activity

 

http://en.wikipedia.org/wiki/PH

[Charlatan]

"A 100mL solution containing 1M sodium acetate was made. The pH was than adjusted to 5.5. A similar solution containing NaCl was also made and treated similarly. Then 1mL of 1M NaOH was added to both solutions. Qualitatively (no numbers/calculations are necessary) explain what if any difference in the change in pH occurs between the two solutions. If the pH changes in the two solutions are different, explain why. For both solutions, explain (draw) what is happening to all of the chemical entities (e.g molecules) in the solution with the NaOH?"----Any help would be great!!

 

pH stands for potential for hydrogen ion concentration. The scale is used to measure acidity vs alkaline substances. It ranges from 0-14, with acidic compounds/ substances such as HCl having a pH close to zero, while alkaline compounds/substances such as bleach having a pH close to 14.

 

The chemicals are being dissolved by the cholrine in the test tubes, but, they are not becoming gasses, becuase theyare remaining liquids. The cholrine turns them into purer substnances, and makes them change colour to become more like a colourless liquid because they dissolve the pigment too.

 

What you will have left is acid who's strength depends on the amount of chlorine in it; acids and akalines.

Edited May 5, 2010 by swansont
fix quote tag