Lab Practical Study Guide 11 21 2012 Determine calorimeter constant in J C for a Styrofoam cup calorimeter Measure Net instructions On Main Menu F2 Temperature Temperature vs Time Half fill a 150 ml beaker with ice and water Put temperature probe inside beaker Press calibrate Enter 0 0 C as temperature When temp stabilizes press enter Press setup and then press F1 to establish parameters Use arrow keys to navigate Set min to 15 18 C and max to 70 75 C Set X from 0 secs to 250 secs Press Display to accept all values Obtain two Styrofoam cups nested inside each other Obtain 45 50 g of cool water inside cup Measure exact amount Put cardboard over cup and place cup on magnetic stirrer The temperature probe is inserted into a 2 hole stopper and secured to a ring stand with a utility clamp The temperature probe is inserted through the hole in the calorimeter lid Position the probe so that its tip is 1 cm from the bottom of the calorimeter Be careful not to poke a hole in the bottom of the Styrofoam cup A stir bar is placed in the bottom of the calorimeter Add 60 ml of water to a 150 ml or 250 ml beaker Heat it for two minutes Take the temperature If it is less than 45 60 above room temp reheat for a min Measure out 50 ml of the hot water Assume density to be 1 00 g ml Press start on MeasureNet Start magnetic stirrer After 5 secs pour in hot water Press Stop after equilibrium Press File Options then press F3 to save file Calculations mwarm x Cwarm x Delta Twarm mcool x Ccool X Delta Tcool q calorimeter C 4 18 j gC Ccalorimeter q calorimeter Delta T cool Determine the H for the dissolution of an ionic compound You will be given the calorimeter constant Experiment 19 On Main Menu F2 Temperature Temperature vs Time Half fill a 150 ml beaker with ice and water Put temperature probe inside beaker Press calibrate Enter 0 0 C as temperature When temp stabilizes press enter Press setup and then press F1 to establish parameters Use arrow keys to navigate Set min to 15 18 C and max to 70 75 C Set X from 0 secs to 250 secs Press Display to accept all values Obtain two Styrofoam cups nested inside each other Obtain 45 50 g of cool water inside cup Measure exact amount Obtain two Styrofoam cups nested inside each other Put cardboard over cup and place cup on magnetic stirrer The temperature probe is inserted into a 2 hole stopper and secured to a ring stand with a utility clamp The temperature probe is inserted through the hole in the calorimeter lid Position the probe so that its tip is 1 cm from the bottom of the calorimeter Be careful not to poke a hole in the bottom of the Styrofoam cup A stir bar is placed in the bottom of the calorimeter Obtain 25 ml of distilled water and 1 000 g of salt measure exactly Take initial temp of salt room temp Pour water into calorimeter Press start on MeasureNet Start magnetic stirrer After 5 secs pour in salt Press Stop after equilibrium Press File Options then press F3 to save file Calculations H dissolution Total mass 25g mass of salt x 4 18 x Delta T qcalorimeter moles salt 3 Determine the H for an acid base reaction You will be given the calorimeter constant Experiment 19 On Main Menu F2 Temperature Temperature vs Time Half fill a 150 ml beaker with ice and water Put temperature probe inside beaker Press calibrate Enter 0 0 C as temperature When temp stabilizes press enter Press setup and then press F1 to establish parameters Use arrow keys to navigate Set min to 15 18 C and max to 70 75 C Set X from 0 secs to 250 secs Press Display to accept all values Obtain two Styrofoam cups nested inside each other Obtain 45 50 g of cool water inside cup Measure exact amount Obtain two Styrofoam cups nested inside each other Put cardboard over cup and place cup on magnetic stirrer The temperature probe is inserted into a 2 hole stopper and secured to a ring stand with a utility clamp The temperature probe is inserted through the hole in the calorimeter lid Position the probe so that its tip is 1 cm from the bottom of the calorimeter Be careful not to poke a hole in the bottom of the Styrofoam cup A stir bar is placed in the bottom of the calorimeter Obtain 20 ml of acid substance A and 20ml of salt substance B measure exactly Take initial temp of both room temp Pour substance A into calorimeter Press start on MeasureNet Start magnetic stirrer After 5 secs pour in substance B Press Stop after equilibrium Press File Options then press F3 to save file Calculations o Write a balanced chemical equation for the reaction Determine limiting reactant Limiting reactant will be used in determining calculations o Msolution Add up volumes and multiply by 1 00g ml 40 0g o q reaction mass solution 40 00g x 4 18 x Delta T Ccalorimeter x Delta T o H reaction q reaction moles of limiting reactant x moles limiting reactant moles reaction Determine the specific heat of an unknown metal You will be given the calorimeter constant Experiment 2 On Main Menu F2 Temperature Temperature vs Time Half fill a 150 ml beaker with ice and water Put temperature probe inside beaker Press calibrate Enter 0 0 C as temperature When temp stabilizes press enter Press setup and then press F1 to establish parameters Use arrow keys to navigate Set min to 15 18 C and max to 70 75 C Set X from 0 secs to 250 secs Press Display to accept all values Obtain two Styrofoam cups nested inside each other Obtain 45 50 g of cool water inside cup Measure exact amount Put cardboard over cup and place cup on magnetic stirrer The temperature probe is inserted into a 2 hole stopper and secured to a ring stand with a utility clamp The temperature probe is inserted through the hole in the calorimeter lid Position the probe so that its tip is 1 cm from the bottom of the calorimeter Be careful not to poke a hole in the bottom of the Styrofoam cup A stir bar is placed in the bottom of the calorimeter Obtain 15 20g record exact of unknown metal and record unknown number Put unknown metal inside a test tube then place test tube inside a 250 ml beaker Place beaker on hot plate and add about 125 ml of water to beaker Bring water to gentle boil Secure test tube to a ring stand using a utility clamp Heat test tube for 10 minutes Take temperature of metal using thermometer and record Press start on MeasureNet Start magnetic stirrer After 5 secs pour in metal Press Stop after equilibrium Press File Options then press F3 to save file Calculations substance …