Answer:
25.6mL NaOH
Explanation:
We are given the Molarity of the solution (
) and the volume of the solution (.02L).
By multiplying the two together, we can find the moles of solution that are reacted with HCl.
This gives us .0082 moles of HCl.
We then find the moles of NaOH that are needed to react with the HCl using the equation.
As HCl and NaCl have a 1:1 ratio, we need .0082 mol of NaOH.
Dividing this value by the Molarity of the solution
Gives us the answer, in Liters (.0256), which we can then divide by 100 convert to mL.
Answer:
4.504g of acetic acid
Explanation:
The acetic acid in reaction with NaOH produce acetate ion, thus:
CH₃COOH + NaOH → CH₃COO⁻ + H₂O + Na⁺
<em>That means the moles of acetate buffer comes, in the first, from the acetic acid</em>
As you need 500mL (0,500L) of a 0.150M acetate buffer, moles are:
0.500L × (0.150mol / 1L) = <em>0.075 moles of acetate</em>. That is:
0.075mol = [CH₃COO⁻] + [CH₃COOH]
Thus, grams of acetic acid you need to prepare the buffer are:
0.075 moles acetic acid × (60.05g / 1mol) = <em>4.504g of acetic acid</em>
Answer:
Part A. The solubility of gases in water increases with increasing temperature.
Part B. Hexane (C₆H₁₄)
Explanation:
Part A
<em>Considering factors that affect that solubility which statement below true?
</em>
- <em>With a few exceptions, the solubility of most solid solutes in water decreases as the solution temperature increases.</em> FALSE. With a few exceptions, the solubility of most solid solutes in water increases as the solution temperature increases.
- <em>The solubility of gases in water increases with increasing temperature. </em>
FALSE. In general, the solubility of gases decreases with increasing temperature.
- <em>The solubility of a gas in any solvent is increased as the partial pressure of the gas above the solvent Increases.
</em> TRUE. According to Henry's law, the solubility of a gas in a liquid is proportional to its partial pressure.
- <em>Substances with similar intermolecular attractive forces tend to be insoluble in one another.</em> FALSE. Substances with similar intermolecular attractive forces tend to be soluble in one another.
Part B
<em>
Which of these is the best solvent for nonpolar solutes?
</em>
<em>acetone (CH₃COCH₃)
</em>
<em>ethanol (CH₃CH₂OH)
</em>
<em>hexane (C₆H₁₄)
</em>
<em>water</em>
There is a general rule that states "like dissolves like", meaning polar is soluble in polar and nonpolar is soluble in nonpolar. Thus, hexane, which is the least polar solvent, would be the best choice for nonpolar solutes.
Microscopes since cells were discovered bc of them
