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Post Lab Questions: type in your answers to the following questions Determine what effect the following errors would have on the value for the mass percent water for your hydrate 1. The hydrate was not heated long enough to drive off all the water a. This error will increase decrease leave unchanged the mass in grams for the suminum Eproma after heating b. The error for mass of the aluminum dish Epsom salt after heating that you determined above will result in an increase/decrease leave unchanged for your calculation of the mass of the dehydrated Epsom salt c. This will increase/decrease/leave unchanged the value for the mass of water lost from hydrated salt in your calculations d. The error will cause your calculation of mass percent of water in your hydrate to be higher owerhunchanged than it actually is. Use your answers from parts 1-3 above to determine if you will be high or low. 2. You accidently spilled some of the dehydrated Epsom salt (Epsom salt after heating) before taking its mass. a. This error will increase/decrease/leave unchanged the mass in grams for the aluminum pan + Epsom sal after heating b. The error for mass in grams for the aluminum pan + Epsom salt that you determined above will result in an increase/decrease/unchanged for your calculation of the mass of the dehydrated MgSo.. c. This will increase/decrease leave unchanged the value for the mass of water lost from hydrated salt in your calculations d. The error will cause your calculation of mass percent of water in your hydrate to be higherllowerlunchanged than it actually is. Use your answers from parts 1-3 above to determine if you will be high or low. 3 The lab group next to you thought it would be amusing to mess up your results, and after your final heating they added a small amount of solid to your crucible when you were not looking. Use the type of step-by-step analysis you used in 2a) and 2b) above to explain if this error would cause your mass % to calculate higher or lower than should be. Explain your reasoning.

Answer 1

1)As the hydrate of the chemical component,i not properly heated to evaporate all of the water the following errors are introduced in the system:

a)The error in the mass of the aluminium dish + epsom salt increases as the some of the water components are left in crystalline form of the epsom salt.   

b)The mass will be more when compared to the dehydrated form of the epsom salt.

c)This will decrease the amount of the mass of the water lost present in the calculated values of the epsom salt component.

d)As the mass of the hydrated salt is less when compared to the dehydrated form of the epsom salt,the mass fraction will be lower that it actually is.