A student dispensed successive volumes of deionized water from a 50.00-mL buret

Question

A student dispensed successive volumes of deionized water from a 50.00-mL buret into a tared 125-mL Erlenmeyer flask and obtained the data below. The temperature of the water was 22 °C. Calculate the density, absolute deviation (abs dev,lx - ) and the percent error of each of the density results, and then calculate the average density, mean absolute deviation (MAD) and average percent error for the four measurements. Show your work, including units, for at least one of the trials. Copy and complete the table below in your lab notebook. 5. Calculated abs dev 1x1- density of 1 % error | Item(s) weighed H20 (gmL) 125-mL Erlenmeyer flask 125-mL Erlenmeyer flask+20.00 mL H20 125-mL Erlenmeyer flask +20.00 mL H20+12.50 mL H20 125-mL Erlenmeyer flask +20.00 mL H2012.50 mL H20+7.20 mL H2O 125-mL Erlenmeyer flask + 20.00 mL H20+12.50 mL H20+7.20 mL H20 +4.73 mL H2O Average 93.432 113.311 125.826 32.997 37.687

Explanation / Answer

calculated density

Of water(g/mL)

abs dev

125 mL Erlenmeyer flask+20.00mL water

So, here the average density is 0.800 g/mL at 22°C.

Average % error = total % error ÷ no. Of experiment

= 1.249%

Mean absolute deviation(MAD)= 0.01

Items weighed Mass(g)

calculated density

Of water(g/mL)

% error

abs dev

125-mL Erlenmeyer flask 93.432

125 mL Erlenmeyer flask+20.00mL water

113.311 0.781 2.37 0.019 125mL Erlenmeyer flask+32.5 mL water 125.826 0.799 0.125 0.001 125 mL Erlenmeyer flask+ 39.7 mL water 132.997 0.807 0.875 0.007 125 mL Erlenmeyer flask+44.43 mL water 137.687 0.813 1.625 0.013 Average (of four readings) 0.800 1.249 0.01

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