Answer: The pH after 0.02 mol of are added to 0.72 L of the solution is 9.5.
Explanation:
The chemical equation for the dissociation of base represented by B in water is depicted as follows.
According to Henderson-Hasselbach equation,
pH =
9.31 =
= 9.31 + 0.361
= 9.671
Initial moles of B is as follows.
= 0.1224 mol B
Now, the initial concentration of is as follows.
= 0.281 mol
We will calculate the equilibrium moles after the addition of 0.02 moles which is 0.04 moles as follows.
Initial: 0.281 0.04 0.1224
Change: -0.04 -0.04 +0.04
Equilbm: 0.241 0 0.1624
Hence,
pH =
=
=
= 9.671 - 0.171
= 9.5
Thus, we can conclude that the pH after 0.02 mol of are added to 0.72 L of the solution is 9.5.
Answer is: <span> concentration of the original lead(II) nitrate solution is 4,88 mol/l.
</span>Chemical reaction: Pb(NO₃)₂ + 2NaCl → PbCl₂ + 2NaNO₃.
V(Pb(NO₃)₂) = 2 ml = 0,002 l.
m(PbCl₂) = 3,407 g.
n(PbCl₂) = m(PbCl₂) ÷ M(PbCl₂).
n(PbCl₂) = 3,407 g ÷ 278,1 g/mol.
n(PbCl₂) = 0,0122 mol.
From chemical reaction: n(PbCl₂) : n(Pb(NO₃)₂) = 1 : 1.
n(Pb(NO₃)₂) = 0,0122 mol.
c(Pb(NO₃)₂) = n(Pb(NO₃)₂) ÷ V(Pb(NO₃)₂).
c(Pb(NO₃)₂) = 0,0122 mol ÷ 0,002 l.
c(Pb(NO₃)₂) = 6,1 mol/l in 80 ml.
c(Pb(NO₃)₂) = 6,1 mol/l · 0,8 = 4,88 mol/l.
Answer:
See explanation
Explanation:
A word equation tries to depict a chemical reaction in words. Letters rather than only chemical formulas are used to show the reaction equation.
Now we want to write a word equation that shows the reaction of sodium hydroxide solution and aluminium sulphate solution:
Alumunium sulphate + sodium hydroxide ------>Aluminium hydroxide + sodium sulphate
Answer:
Energy
Explanation:
Air water and the sun form energy. Unless your talking about evaporation, which water gets heated from the sun which turns into air (water vapor)
Answer:
A. Mafic; iron and/or magnesium
Explanation:
Let's find the answer by naming some minerals and their chemistry.
Mafic minerals are dark-colored whereas felsic minerals are light-colored, thats way mafic rocks are dark-colored because they are mainly composed by mafic minerals and the other way around for felsic rocks.
But remember that mafic minerals as amphiboles, pyroxenes or biotites, involve in their chemical structure iron and/or magnesium. Although calcium and sodium can be incorporated in amphiboles and clinopyroxenes, they are not involved in orthopyroxenes and biotites. On the other hand, although potassium is involved in biotite and in some extent in amphiboles, this element is not involved in pyroxenes.
So in conclusion, mafic minerals are usually dark-colored because they involve iron and/or magnesium in their chemical structures.