Answer:
<u>Mass concentration (g/L) </u><u><em>= 2.49g/L.</em></u>
Explanation:
No. of moles =
= = 0.001245 moles
Concentration of KHP (C1) in litres = n/v
= = 0.062 mol/L
We know that:
=
where c1v1 and c2v2 are the products of concentration and volumes of KHP and NaOH respectively.
Since mole ratio is 1 : 1.
1 mole of NaOH - 40g
0.001245 mole of NaOH = 40 × 0.001245 = 0.0498g
⇒0.0498g of NaOH was used during the titration
<u><em>∴Mass concentration (g/L) = 0.0498g ÷ 0.02L</em></u>
<u><em>= 2.49g/L.</em></u>
Answer:
c. 1.5 mol
Explanation:
- Firstly, we need to calculate the no, of moles of 39.0 grams of calcium fluoride.
n = mass / molar mass = (39.0 g) / (78.07 g/mol) = 0.499 mol ≅ 0.5 mol.
- CaF₂ ionized in water as:
<em>CaF₂ → Ca⁺² + 2F⁻.</em>
Every 0.1 mole of CaF₂ is ionized to 3 ions (1 ion of Ca⁺² and 2 ions of F⁻).
<em>So, 0.5 mol of CaF₂ will contain (3 x 0.5 mol = 1.5 mol) of ions.</em>
Thus, the right choice is "c. 1.5 mol".
Bellow you may find the names and structure of the poliatomic ions.
Explanation:
sulfate SO₄²⁻
nitrate NO₃⁻
perphosphate PO₅²⁻
hypoiodite IO⁻
chlorite ClO₂⁻
phosphite PO₃³⁻
percarbonate H₃CO₆²⁻
bromate BrO₃⁻
hyposulfite SO₂²⁻
permanganate MnO₄⁻
carbonite CO₂²⁻
CO₃²⁻ carbonate
MnO₃⁻ manganate
SO₅²⁻ persulfate
BrO₂¹⁻ bromite
CO₄²⁻ percarbonate
PO₅³⁻ perphosphate
ClO¹⁻ hypochlorite
IO₂¹⁻ iodate
PO₄³⁻ phosphate
NO₂¹⁻ nitrite
SO₄²⁻ sulfate
Learn more about:
polyatomic ions
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I would say it’s 4
Nsjdksks
Answer:
i think is b but im not sure
Explanation: