Oxalic acid (C2H2O4) is a diprotic acid. A student was testing a lab sample that contained some diprotic acid. The student measured out 2.50 g of the sample and added it to a 250 mL volumetric flask. The student then added water to make it up to 250 mL. The student took out 25 mL aliquot into a conical flask. This was then titrated with potassium hydroxide solution with a concentration of 1.20 M. The following titres were obtained: 15.25 mL, 15.10 mL, 15.00 mL and 15.02 mL. a. Calculate the concentration of oxalic acid in the 25 mL aliquot.

b. Calculate the concentration of oxalic acid in the 250 mL volumetric flask.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

rosa was looking for patterns to predict the products of chemical reactions. she recorded three similar decomposition reactions in the table.she should record 2licl + 3o2.

in the last row of the table. it is the thermal decomposition of chlorate lithium, hence, she should record these products as: lithium chloride ( 2licl ) and oxygen ( 3o2 )   2 > 2 licl + 3o2.