Calculate the percent error if the experimental value of the density of copper is 21.2 g/cm3 and the accepted value is 22.1 g/cm3?

a. 4.07%
b. 4.19%
c. 4.02%
d. 4.25%

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.