A aquifer is the underground layer which is composed of water-bearing rocks. Sandstone, sands, gravel, and other sedimentary rocks are examples of water-bearing rocks. They are permeable and have openings that gases and liquids can pass through. In a water cycle, a water will be added to the aquifer during the precipitation.
Answer:
4.44 M
Explanation:
The absorbance of a solution is a function of its concentration through the equation, known as Beer's law, as:
A = ε c l
where A is the absorbance, ε is is a constant of proportionality called molar absorptivity in units of L/mol·cm, c is the concentration in mol/L (M), and l is the length of the cuvette we use to measure the absorbance, usually 1 cm.
Now the above equation is a function of c in the form y= mx + b, which is exactly the linear relationship stated in the question.
Therefore
y = 0.0425 + 0.011
A = (εl) c
Therefore
slope = m = ε (1) = 0.0425
Knowing ε we can calculate the concentration of the diluted unknown:
0.200 = 0.0425 c + 0.011
c = (0.200 - 0.011)/0.425 = 0.44 M
This the concentration of the diluted solution, the original concentration of the unknown solution can be calculated from the formula V₁M₁ = V₂M₂
calling M₁ our undiluted solution, we have
M₁ = V₂M₂/V₁ = 50 mL x 0.44 M / 5.00mL = 4.44 M
(Notice there is no need to convert the volume to liters in the above equation since they appear in both sides of the equation and so they cancel each other).
When the dissociation equation of NH3 is:
NH3(aq) + H2O ↔ NH4(aq) + OH-(aq)
when Kb =(1.8 x 10^-5)
and when PH+POH= 14
∴ POH = 14 -11= 3
when POH = -㏒[OH]
∴[OH] = 0.001
when [OH] = [NH4+] = 0.001
when Kb = [NH4+][OH-]/[NH4OH]
by substitution:
1.8 x 10^-5 = (0.001)^2 / [ NH4OH]
∴[NH4OH] = 0.06 M
According to the Aufbau principle, the 4s sublevel<span> is filled </span>before the 3d sublevel <span>because the </span>4s<span> is lower in energy. ... This is why when </span>electrons<span> are lost from the </span>orbitals<span> of the transition metals, they are lost from the </span>4s<span> first because it is higher in energy</span>