Exactly 5.00 ml aliquots of a solution containing phenobarbital were measured into 50.00ml volumetric flasks and made basic with koh. the following volumes of a standard solution of phenobarbital containing 2.00 µg/ml of phenobarbital were then introduced into each flask and the mixture was diluted to volume: 0.00, 0.500,1.000, 1.50, and 2.00ml. the fluorescence of each of these solutions was measured with a flurometer, which gave volumes of 3.26, 4.80, 6.41, 8.02, and 9.56 respectively. a) pot the data? b) using the plot from (a) calculate the concentration of phenobarbital in the unknown. c) derive a least- squares equation for the data. d) find the concentration of phenobarbital from the equation in (c) e) calculate a standard deviation for the concentration obtained in (d)

possibly, yes.

explanation:

the amount of sugar you take in is dangerously high, risk of heart disease, high risk of diabetes, and etc.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.