Fe2O is the formula for that
I think you forgot to give the options along with the question. I am answering the question based on my knowledge and research. "Test a third group that does not receive the supplement" would be the procedure that would have made the <span>outcome of this study more valid. I hope the answer helps you.</span>
![pH = 13.5](https://tex.z-dn.net/?f=%20pH%20%3D%2013.5%20)
Explanation:
Sodium hydroxide completely ionizes in water to produce sodium ions and hydroxide ions. Hydroxide ions are in excess and neutralize all acetic acid added by the following ionic equation:
![\text{HAc} + \text{OH}^{-} \to \text{Ac}^{-} + \text{H}_2\text{O}](https://tex.z-dn.net/?f=%20%5Ctext%7BHAc%7D%20%2B%20%5Ctext%7BOH%7D%5E%7B-%7D%20%5Cto%20%5Ctext%7BAc%7D%5E%7B-%7D%20%2B%20%5Ctext%7BH%7D_2%5Ctext%7BO%7D%20)
The mixture would contain
if
undergoes no hydrolysis; the solution is of volume
after the mixing. The two species would thus be of concentration
and
, respectively.
Construct a RICE table for the hydrolysis of
under a basic aqueous environment (with a negligible hydronium concentration.)
![\begin{array}{cccccccc} \text{R} & \text{Ac}^{-}(aq) &+ & \text{H}_2\text{O}(aq) & \leftrightharpoons & \text{HAc}(aq) & + & \text{OH}^{-} (aq)\\ \text{I} & 0.10 \; \text{M} & & & & & &0.30 \; \text{M}\\ \text{C} & -x \; \text{M}& & & & +x \; \text{M}& & +x \; \text{M} \\ \text{E} & (0.10 - x) \; \text{M} & & & & x \; \text{M} & & (0.30 +x) \; \text{M} \end{array}](https://tex.z-dn.net/?f=%20%5Cbegin%7Barray%7D%7Bcccccccc%7D%20%5Ctext%7BR%7D%20%26%20%5Ctext%7BAc%7D%5E%7B-%7D%28aq%29%20%26%2B%20%26%20%5Ctext%7BH%7D_2%5Ctext%7BO%7D%28aq%29%20%26%20%5Cleftrightharpoons%20%26%20%5Ctext%7BHAc%7D%28aq%29%20%26%20%2B%20%26%20%5Ctext%7BOH%7D%5E%7B-%7D%20%28aq%29%5C%5C%20%5Ctext%7BI%7D%20%26%200.10%20%5C%3B%20%5Ctext%7BM%7D%20%26%20%26%20%26%20%26%20%26%20%260.30%20%5C%3B%20%5Ctext%7BM%7D%5C%5C%20%5Ctext%7BC%7D%20%26%20-x%20%5C%3B%20%5Ctext%7BM%7D%26%20%26%20%26%20%26%20%2Bx%20%5C%3B%20%5Ctext%7BM%7D%26%20%26%20%2Bx%20%5C%3B%20%5Ctext%7BM%7D%20%5C%5C%20%5Ctext%7BE%7D%20%26%20%280.10%20-%20x%29%20%5C%3B%20%5Ctext%7BM%7D%20%26%20%26%20%26%20%26%20x%20%5C%3B%20%5Ctext%7BM%7D%20%26%20%26%20%280.30%20%2Bx%29%20%5C%3B%20%5Ctext%7BM%7D%20%5Cend%7Barray%7D%20)
The question supplied the <em>acid</em> dissociation constant
for acetic acid
; however, calculating the hydrolysis equilibrium taking place in this basic mixture requires the <em>base</em> dissociation constant
for its conjugate base,
. The following relationship relates the two quantities:
![pK_{b} (\text{Ac}^{-}) = pK_{w} - pK_{a}( \text{HAc})](https://tex.z-dn.net/?f=%20pK_%7Bb%7D%20%28%5Ctext%7BAc%7D%5E%7B-%7D%29%20%3D%20pK_%7Bw%7D%20-%20pK_%7Ba%7D%28%20%5Ctext%7BHAc%7D%29%20)
... where the water self-ionization constant
under standard conditions. Thus
. By the definition of
:
![[\text{HAc} (aq)] \cdot [\text{OH}^{-} (aq)] / [\text{Ac}^{-} (aq) ] = K_b = 10^{-pK_{b}}](https://tex.z-dn.net/?f=%20%5B%5Ctext%7BHAc%7D%20%28aq%29%5D%20%5Ccdot%20%5B%5Ctext%7BOH%7D%5E%7B-%7D%20%28aq%29%5D%20%2F%20%5B%5Ctext%7BAc%7D%5E%7B-%7D%20%28aq%29%20%5D%20%3D%20K_b%20%3D%20%2010%5E%7B-pK_%7Bb%7D%7D%20)
![x \cdot (0.3 + x) / (0.1 - x) = 10^{-9.3}](https://tex.z-dn.net/?f=%20x%20%5Ccdot%20%280.3%20%2B%20x%29%20%2F%20%280.1%20-%20x%29%20%3D%2010%5E%7B-9.3%7D%20)
![x = 1.67 \times 10^{-10} \; \text{M} \approx 0 \; \text{M}](https://tex.z-dn.net/?f=%20x%20%3D%201.67%20%5Ctimes%2010%5E%7B-10%7D%20%5C%3B%20%5Ctext%7BM%7D%20%5Capprox%200%20%5C%3B%20%5Ctext%7BM%7D%20)
![[\text{OH}^{-}] = 0.30 +x \approx 0.30 \; \text{M}](https://tex.z-dn.net/?f=%20%5B%5Ctext%7BOH%7D%5E%7B-%7D%5D%20%3D%200.30%20%2Bx%20%5Capprox%200.30%20%5C%3B%20%5Ctext%7BM%7D%20)
![pH = pK_{w} - pOH = 14 + \text{log}_{10}[\text{OH}^{-}] = 14 + \text{log}_{10}{0.30} = 13.5](https://tex.z-dn.net/?f=%20pH%20%3D%20pK_%7Bw%7D%20-%20pOH%20%3D%2014%20%2B%20%5Ctext%7Blog%7D_%7B10%7D%5B%5Ctext%7BOH%7D%5E%7B-%7D%5D%20%3D%2014%20%2B%20%5Ctext%7Blog%7D_%7B10%7D%7B0.30%7D%20%3D%2013.5%20)
Answer:
a
Explanation:
most of the world is made of water because the oceans.
Answer:
The answer is below
Explanation:
The density of an object is its mass per unit of volume. Dense objects feel very heavy for their size, while for objects with low density they are very light for their size.
Density is the ratio of mass to volume; it is given by:
Density (D) = mass (m) / volume (V)
An object sinks in water if the density of the object is greater than the density of water. While an objects floats on water if the density of the object is les than the density of water