Consider these possible sources of error described below. Explain the effect of
ID: 768722 • Letter: C
Question
Consider these possible sources of error described below. Explain the effect of each on our calculated molar heats of neutralization. Indicate which items of data would be in error and the effect. 1. what happens if you fail to adjust the temperature of the acid and base to the same temperature before you mix them? 2. You splashed some of the NaOH out of the calorimeter while pouring in step 10.0 3. You had only 0.498 g of KNO3 instead of 1 g and you recorded this value on the report form. 4. You did not consider the heat capacity of the calorimeter in your calculations. 5. some water from the hot test tube dripped into the calorimeter while you were transferring the hot metal. 6. You did not stir the calorimeter but allowed 10 minutes for the temperature to equalize.Explanation / Answer
follow this a) You fail to adjust the temperature of the acid and base to the same temperature before mixing them. usually you are provided with pre-made soltuions of HCl & NaOH which have equilibrated to the same temp. if so,...this should have dH = "no effect" if you made your own NaOH solution, it would have a much higher temp than the HCl. if you have the thermometer in the NaOH to monitor the dT, it will not rise as high as it should, for it will be partially cooled by the colder HCl giving a dH = "too small" if you made your own NaOH solution, it would have a much higher temp than the HCl. if you have the thermometer in the HCl to monitor the dT, it will rise higher than it should, for it will be partially heated ed by the hotter NaOH giving a dH = "too large" ======================================