Question

I really need help understanding the second question?

2.) calculate the percent mass in your hydrate. If the copper(ii) sulfate hydrate should contain 36.08% by mass of water, what is the % error of your experimental result?

4. Decant about 1/4 of the solution into another clean test tube. In the fume hood, carefully add I drop of concentrated ammonium hydroxide (aqueous ammonia) into the test tube and gently swirl. KEEP YOUR NOSE AWAY FROM THE AQUEOUS AMMONIA FUMES! Record your observations. Continue adding the concentrated ammonium hydroxide carefully until no more changes occur. Dispose of this solution in the proper disposal container in the hood before returning to your bench. Be sure to also rinse out your test tube with water - I observed that the bareon ammon), diant mix altist and it was hanogenows them and the DATA TABLES color was blue for quou ammonia There the word om hight blue to dark blue obter and The following data tables must be in your notebook before you begin the laboratory polec Swid Collected Data Mass of empty crucible, 8 Mass of crucible and hydrated CuSO4. g Mass of crucible and residue after 1" heating, & Mass of crucible and residue after 2 heating, g Mass of crucible and residue after 3 heating, g (if necessary) 15.2393 27.5149 Tous 29.2213 28.600g 28.602 6.82 x 10 molt = = 63.546 Masse 5 = 32.066 28.602 -27.514=1088g of anhydrous Calculated Data 3.65 X 10'mol 29221 - 26 GOL = 0.619 - 0.619g of water Mass of hydrated CuSO4,8 AY 1.7079 Mass of anhydrous CuSO4. g ONI 088 / Number of moles of anhydrous CuSO4 * Mass of water lost from the hydrated CuSO4 sample,g 10.619 Number of moles of water in the hydrated CuSO4 sample |3.88×108 mold Mole ratio of H2O/CuSO4 5:1 2 - 4x 16 Formula of the hydrated CuSO4 (504 5H₂O oor hang of Cusoa z/lmal op Cuson - 6.82 x 10 mol antydrous FOLLOW-UP QUESTIONS Visa 612 9 LUSO CuSO4 3.88 × 103 1. What are the formula and name of your hydrate? 6.82*10 - - 5:1 2. Calculate the percent by mass of water in your hydrate. If the copper(II) sulfate hydrate should contain 36.08 % by mass of water, what is the % error of your experimental result?

Answer 1

© Mass of hydrated CuSO4 = 1.7079 Mass of water in the hydrated "cusO4 = 0.6199 ...% mass of water in the sample = 6:6027100)= 3626%. (Ane) The actual % mass of water in CuSO4 = 36:08% ::% error in the experiment = 36.26.-36.08) 100%, 0.50% (Ans)