Question

In: Chemistry

Compound A is a water-soluble solid at room temperature with a molecular weight of 138.12 amu....

Compound A is a water-soluble solid at room temperature with a molecular weight of 138.12 amu. Describe one (or more) experiment(s) that you would perform in lab to determine if Compound A is a strong acid, weak acid, strong base, weak base, or none of these in water. State what you would do, what you would measure, and how you would decide the nature of Compound A in water?

Solutions

Expert Solution

There are two ways to decide the nature of Compound . Both these ways are based on one common principle,pH.pH is a numerical scale which is used to identify the nature of a given compound in its solution with water, The pH scale ranges from 0 to 14. If the pH of the solution of a compound with water is less than 7, then the compound is acidic whereas if the pH is more than 7 then the compound is basic. On the other hand, if the pH of solution is 7 then the compound is neutral.

In this case, the compound A when mixed with water will give a homogeneous solution. In the first method, this soluton is then tested on pH paper. pH paper is a small strip which when dipped in the solution or a drop of solution is placed on the pH strip, the strip will change its color based on the pH of the solution. This color can be then matched with the color code mentioned on the packing of the pH strip and the pH value associated with a color on the package of the pH strip,the solution's pH can be estimated. If the color of pH strip is green, then the compound A is neutral. If the color of the strip becomes red (pH =2) or dark red(pH <=1), then compound A is strong acid and if the color of the strip becomes dark blue (pH=13) or a dark purple(pH=14), then compound A is strong base. If the color of pH strip is orangish to light greenish, then its pH lies between 2 to 7 indicating compound A is weak acid. If the color of the pH strip is between dark green to blue, then the pH lies between 7 to 12 indicating compound A to be a weak base.

Another method is to use the pH meter. This pH meter has a glass probe which measures the solution's ion conncentration when inserted in the solution. When the probe is placed in the solution it will yield the exact pH numerical value of the solution of compound A. As in previous case, if the numerical value of pH from pH meter gives value less than or equal to 2, then the compund A is strong acid. If pH lies between 2 to 7 then it is weak acid.Similarly, if pH lies between 7 and 13 then the compound A is weak base whereas if pH is greater or equal to 13 then compound A is strong base.


Related Solutions

3. Ethanol (MW = 46) is soluble in water and is a liquid at room temperature,...
3. Ethanol (MW = 46) is soluble in water and is a liquid at room temperature, but propane (MW = 44) is insoluble in water and is a gas at room temperature. Explain why these two compounds have such different properties despite their similar size.
If we want to only use frozen water (ice) and room temperature water (room temperature water...
If we want to only use frozen water (ice) and room temperature water (room temperature water of four times the mass of the ice), write out the various forms of heat transfer that will occur between frozen water and room temperature water, when the come into contact. Hint: There will be one term of heat transfer from the room temperature water, and three terms of heat transfer in the ice/cold water.
How do you know a compound is water soluble?
How do you know a compound is water soluble?
Which type of compound is an electrolyte if it is soluble in water? a) an ionic...
Which type of compound is an electrolyte if it is soluble in water? a) an ionic compound soluble in water b) a nonpolar molecular compund not soluble in water c) a polar molecular covalent compound that is not a strong acid and does not ionize in water 2. When an electrolyte is dissolved in water, which of the following can carry the electric current in the aqueous solution? a) water molecules b) cations c) anions d) both cations and anions...
Which type of compound is an electrolyte if it is soluble in water? a) an ionic...
Which type of compound is an electrolyte if it is soluble in water? a) an ionic compound soluble in water b) a nonpolar molecular compund not soluble in water c) a polar molecular covalent compound that is not a strong acid and does not ionize in water 2. When an electrolyte is dissolved in water, which of the following can carry the electric current in the aqueous solution? a) water molecules b) cations c) anions d) both cations and anions...
A compound has 95.25g C and 7.75g H. The molecular mass is 52 amu. What is...
A compound has 95.25g C and 7.75g H. The molecular mass is 52 amu. What is the molecular formula?
Boil water in a bowl and cool in a room. The air temperature in the room...
Boil water in a bowl and cool in a room. The air temperature in the room is increasing linearly according to the function Ta (t) = 22 + 0.015t (t in minutes, T in ° C). Assume that Newton's Law of Cooling is satisfied: the rate of change of water temperature is proportional to the difference between the temperature of the water and the temperature of the environment. We take the water temperature after 8 minutes and find that it...
1. A compound composed of carbon, hydrogen & oxygen has a molecular ion at m/z=112 amu...
1. A compound composed of carbon, hydrogen & oxygen has a molecular ion at m/z=112 amu in its mass spectrum. The base peak is at m/z=28 amu. The infrared spectrum shows strong absorption in the 2850 to 2980 cm-1 region, and very strong absorption at 1717 cm-1. The 1H nmr shows a single sharp signal at ? = 2.7 ppm, and the 13C nmr has two signals ( ? = 37 & 208 ppm ).
Water is boiled in a bowl and cooled in a room. The air temperature in the...
Water is boiled in a bowl and cooled in a room. The air temperature in the room is increasing linearly according to the function Ta(t) = 30 + 0.01t (t in minutes, T in ∘C. Assume that Newton's Law of Cooling is satisfied: the rate of change of the temperature of the water is proportional to the difference between the temperature of the water and the temperature of the environment. We take the temperature of the water after 10 minutes...
1) Which of the following is a solid at room temperature with the lowest melting point?...
1) Which of the following is a solid at room temperature with the lowest melting point? a. caffine b. sodium carbonate c. water d. dichloromethane e. sodium sulfate 2) Which has the highest density and is solid at room temperature? a. caffine b. sodium carbonate c. water d. dichloromethane e. sodium sulfate
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT