In a titration, a few drops of an indicator are added to a flask containing 35.0 milliliters of HNO3(aq) of unknown concentration. After 30.0 milliliters of 0.15 M NaOH (aq) solution is slowly added to the flask, the indicator changes color, showing the acid is neutralized.
63 The volume of the NaOH(aq) solution is expressed to what number of significant figures? [1]
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I thought it would be 2 sigfigs because of the 0.15M NaOH that has 2 sigfigs, which is the least, but the answer says 3. Help?
The volume of the NaOH(aq) solution is expressed to what number of significant figures?
2016-06-20 10:52 pm
回答 (3)
2016-06-20 10:59 pm
✔ 最佳答案
"0.15M" is not the volume of NaOH. It is the concentration of the NaOH.The volume of NaOH is "30.0 milliliters" which is three significant digits.
2016-06-20 11:02 pm
The volume of NaOH is 30.0 milliliters which is 3 significant figures.
(0.15 M is the molarity of NaOH, but not volume.)
(0.15 M is the molarity of NaOH, but not volume.)
2016-06-20 11:57 pm
You are correct. Others comparing molarity with volume is not valid. In the process of solving you multiply molarity X volume and the rule for multiplication is use the fewest (2) number of sig. figs of the 2 factors. There is no rule I have ever seen about volume being considered separately from concentration or VV.
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