a solid weak acid i weighed, dissolved in water and diluted to exactly 50ml.
25ml of the solution...

Question

a solid weak acid i weighed, dissolved in water and diluted to exactly 50ml. 
25ml of the solution is taken out and is tittrated to a natural endpoin with 
.10M NaOH. The titrated portion is then mixed with the remaining untitrated 
portion and the PH of the mix is measuredmass of acid in grams is 
.629volume of naoh required to reach endpoin in ml 18.3ph 
3.12what is the pkaof the acidwhat is the molarity of the original 
acid solutionwhat is the molecular weight of the acid

David · Accepted Answer

A solid weak acid I weighed dissolved in water and diluted to exactly 50ml. 25ml of the solution is taken out and is titrated to a 
natural endpoint with .10M NaOH. The titrated portion is then mixed with the remaining un-titrated portion and the PH of the 
mix is measured
Mass of acid in grams is .629 
Volume of NaOH required to reach endpoint in ml 18.3 ml 
ph 3.12
2. What is the molarity of the original acid solution?
The mixture has Titrated portion [salt and large amount of un-dissociated acid] and large amounts of original acid [with 
negligible dissociation]
So,

a solid weak acid i weighed, dissolved in water and diluted to exactly 50ml. 25ml of the solution is taken out and is tittrated to a natural endpoin with .10M NaOH. The titrated portion is then mixed...

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