Which phrases accurately describe acids? Check all that apply.
2 answers:
Answer: Option 1, 4 and 5 describe acids accurately.
Explanation:
Option 1: Acids have a sour taste because of the concentration of ion.
Option 2: They are corrosive in nature, that is they are not at all gentle with the skin and fabric as some acids intend to burn skin such as is a strong acid which can burn skin as well as fabric.
Option 3: Acids need electrons to release ions and non-metals do not donate electrons hence, there is no reaction between a non-metal and an acid.
Option 4: All acids do contain hydrogen. They dissociate in the presence of water to produce ions.
Option 5: Acids do conduct electricity that is they carry electrical charges. This was explained by Arrhenius. He said that the acids dissociate into ions, when it is dissolved in water. These ions hence acts as charge carriers in water.
You might be interested in
Answer:
- 7. Linear relationship.
- 8. Because ions carry charge that can move freely in solution.
- 9. Solute: NaCl
Solvent: H₂O
Explanation:
7. Elevation of the boling point.
The elevation of the boiling point of a solution respect to the pure solvent is a colligative property, meaning that it is proportional to the concentration of the solute particles.
Where, ΔTb is the elevation on the boiling point, Tb is the (elevated) boiling of the solution, point, Tb° is the boiling point of the pure solvent, i is the Van't Hoof factor, and C is the molal concentration (molality)
Thus the relation of the boiling point with the mola concentration (molality) is linear.
Using the table and some calculations, you can determine this relationship:
Trial Mass of water mass NaCl moles NaCl m Tb
kg g mol mol/kg ºC
1 0.1 8.76 0.15 1.5 101.5
2 0.1 17.52 0.30 3.0 103.1
3 0.1 20.28 0.45 4.5 104.6
4 0.1 35.04 0.60 6.0 106.1
The number of moles for each trial were determinated dividing the mass in grams of the solute by the molar mass (58.44g/mol).
The molality concentrations (mole of solue per kg of solvent) were determined dividing the number of moles of each trial by the amount of solvent in kg.
As you see in the table, the column of Tb increases by an approximate constant value of 1.5ºC and the column of the molal concentration increases at a constant value of 0.15mol. Thus there is a constante rate of change of 1.5ºC/0.15mol = 10ºC/mol.
Since a constant rate of change means constant slope, this you conclude that the relationship is linear.
8. Ability to conduct an electric current.
Electric current is the flow of charges.
Ions are charged particles. There are positive ions (cations) and negative ions (ions) dissolved; this is, they are free to move in solution.
Current is the rate of flow of the charge, thus the greater the number of ions in solution, the greater the flow of charge, which is a greater current.
That explains why the greater the concentration of the ions in the solution the greater the abiity fo the solution to conduct electricity.
Pure water has a low concentration of ions (H⁺ and OH⁻) thus it has a very low ability to conduct electricity. But adding a solute, like an acid, a base, or a salt (like NaCl in this case), increases the number of ions in solution, and thus a solution with a high concetration of solute will have a great ability to conduct electricity.
9. Identify the solute and solvent.
- The<em> solute </em>is the component of a solutions that is present in relatively small quantities and is dissolved. In this case the solute is the salt, sodium chloride, NaCl.
- The <em>solvent</em> is the component of the solution that is present in greater amount and is able to dissolve the solute. In this case the solvent is water, H₂O.
The concentrations of the solute normally are relatively low, because they are the component with less particles in the solution.