Methyl orange, HMO, is a common acid-base indicator. Insolution it ionizes according to the equation:

HMO↔ H++ MO-

red yellow

If methyl orange is added to distilled water, the solutionturns yellow. If a drop or two of 6 M HCL is added to theyellow solution, it turns red. If to that solution one adds afew drops of 6 M NaOH the color reverts to yellow.

a. Why does addinig 6M HCL to the yellow solution ofmethyl orange tend to cause the color to change to red? (Note thatin solution HCL exists as H+ and Cl-ions.)

b. Why does adding 6 M NaOH to the red solution tend tomake it turn back to yellow? (Note that in solution NaOHexists as Na+ and OH- ions. How doesincreasing [OH-] shift Reaction 3 in the discussionsection? (Reaction 3 isH2O↔ H++OH- ,Kc= [H+] [OH-] = 1x 10-14) How would the resulting change in[H+] affect the dissociation reaction of HMO?)

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

hi my dude or dudette

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.

може ли да зареждате повече информация, моля