Answer is: concentration of hydrogenium ions is 9,54·10⁻⁵ M.
c(HNO₂) = 0,075 M.
c(NaNO₂) = 0,035 M.
Ka(HNO₂) = 4,5·10⁻⁵.
This is buffer solution, so use <span>Henderson–Hasselbalch equation:
pH = pKa + log(c(</span>NaNO₂) ÷ c(HNO₂)).
pH = -log(4,5·10⁻⁵) + log(0,035 M ÷ 0,075 M).
pH = 4,35 - 0,33.
pH = 4,02.
<span>[H</span>₃O⁺] = 10∧(-4,02).
<span>[H</span>₃O⁺] = 0,0000954 M = 9,54·10⁻⁵ M.
Answer:
The chemical equation needs to be balanced so that it follows the law of conservation of mass.
Explanation:
Answer:
Yes because the law of conservation of matter is followed. There are equal numbers of atoms of all elements in the
reactants and products.
Explanation:
A balanced equation conform to the law of conservation of matter. While unbalanced equation suggests that matter has been created or destroyed.
Na3PO4 + 3KOH —> 3NaOH + K3PO4
A careful observation of the above equation proved that the equation is balanced is balanced because there are equal numbers of atoms of all elements in the
reactants and products.
Answer:
Eukarya
Explanation:
It's larger than a prokaryotic cell and it has a nucleus.
Answer:
From the mass of Al reacted, how many moles are present? We don't have the mass of Al reacted
What is the mole ratio between Al and H2 in the balanced chemical reaction?
By stoichiometry, ratio between Al and H₂ is 3:2
What units are required on the temperature when doing calculations with gases? °K degrees
The value of R is 0.082 L.atm/mol.K
Explanation:
A chemical reaction for this can be this one:
2Al (s) + 6HCl (aq) → 2AlCl₃(aq) + 3H₂ (g)
Balanced
To get the moles which are present in the mass of Al reacted you must calculate:
Al Mass / Al molar mass = Al moles
The Ideal Gas equation is this one:
Pressure . Volume = n° moles . R (gases constant) . T°K
The temperature must be in K, because the units of R
We usually use R = 0.082 L.atm/mol.K
