The control reaction leveled Off
Air is an example of a solution. The other two answers are incorrect because they are heterogenous mixtures, not homogenous mixtures(another name for solution).
All objects have mass; so if an object is moving, then it has momentum - it has its mass in motion. The amount of momentum that an object has is dependent upon two variables: how much stuff is moving and how fast the stuff is moving. Momentum depends upon the variables mass and velocity.
The atomic radius<span> actually decreases as you move from left to right in a period (row) of the </span>periodic<span> table. ... The added protons in the nucleus of an </span>atom<span> will pull the </span>electron<span> cloud more tightly inward and shrink the size of the </span>electron<span> cloud which means you have a smaller </span>atomic radius<span>.</span>
Answer:
(a) MOPS
(b) MES
Explanation:
Buffers are solutions whose function is to resist drastic changes in pH when an <em>acid</em> or a <em>base</em> is added. They are formed by 2 components:
- A weak acid and its conjugate base (e.g., HF/F⁻). <u>(acid buffer)</u>
- A weak base and its conjugate acid (e.g., NH₃/NH₄⁺). <u>(basic buffer)</u>
pH and be pOH can be calculated, in each case, according to Henderson-Hasselbalch equations:
pH = pKa + log ([conjugate base]/[weak acid]) <u>(acid buffer)</u>
pOH = pKb + log ([conjugate acid]/[weak base]) <u>(basic buffer)</u>
It is possible to see that when the concentration of acid is equal to that of its base, pH = pKa or pOH = pKb. This is the point where the buffer has its optimum performance. Nevertheless, it has its most effective range of work (buffer range) when the ratio acid:base is between 0.1 and 10. If we take these values into Henderson-Hasselbalch equations, we can see that the optimum range of work is:
- For acid buffer, pH = pKa ± 1
- For basic buffer, pOH = pKb ± 1
In (a) (pH = 7.0), the solution is closet to the pK of the MOPS buffer, so this would be the best choice. Nevertheless, both MES and HEPPS would be suitable options, because their buffer ranges comprise pH = 7.0.
In (b) (pH = 6.0), the solution is closest to the pK of the MES buffer, so this would be the best option. Other buffers are not suitable because pH = 6.0 is out of their buffer range.
