## anonymous one year ago Check work? I suppose I would do this with the proper sig figs? A buret containing NaOH solution has an initial volume reading of 0.14 mL. A 25.00 mL solution of 0.1000 M HCl is titrated to a phenolphthalein end point, which occurs at a final buret reading of 27.16 mL of NaOH. What is the molarity of the NaOH titrant? My work: http://imgur.com/tBITDwk

1. anonymous

@Vocaloid

2. anonymous

*actually, I think I made a mistake with sig figs

3. anonymous

*0.027

4. anonymous

You did the steps to the answer correctly. But there were some mistakes There should be a parentheses like this to avoid confusion. $(27.16-0.14) \times \frac{ 1L }{ 1000mL }$ Since your teacher might think you multiplied it tje 0.14 by 1/1000. Second you do not need to round your significant figures until it is your final answer. (27.16-0.14) x (1/1000) should not be in significant figure. I saw that you rounded the 0.02702 into 0.03. It is not necessary.

5. anonymous

6. anonymous

0.14mL has the least significant figures and your final equation is dividing. Dividing would be the lowest significant figure in the question.

7. anonymous

0.093 M NaOH

8. anonymous

0.003mol NaOH/0.02702L NaOH=0.11M