Answer:
a. 1.7 × 10⁻⁴ mol·L⁻¹; b. 5.5 × 10⁻⁹ mol·L⁻¹
c. 2.3 × 10⁻⁴ mol·L⁻¹; 5.5 × 10⁻⁸ mol·L⁻¹
Explanation:
a. Silver iodate
Let s = the molar solubility.
AgIO₃(s) ⇌ Ag⁺(aq) + IO₃⁻(aq); Ksp = 3.0 × 10⁻⁸
E/mol·L⁻¹: s s
b. Barium sulfate
BaSO₄(s) ⇌ Ba²⁺(aq) + SO₄²⁻(aq); Ksp = 1.1 × 10⁻¹⁰
I/mol·L⁻¹: 0.02 0
C/mol·L⁻¹: +s +s
E/mol·L⁻¹: 0.02 + s s
c. Using ionic strength and activities
(i) Calculate the ionic strength of 0.02 mol·L⁻¹ Ba(NO₃)₂
The formula for ionic strength is
(ii) Silver iodate
a. Calculate the activity coefficients of the ions
b. Calculate the solubility
AgIO₃(s) ⇌ Ag⁺(aq) + IO₃⁻(aq)
(iii) Barium sulfate
a. Calculate the activity coefficients of the ions
b. Calculate the solubility
BaSO₄(s) ⇌ Ba²⁺(aq) + SO₄²⁻(aq
Answer:
Molarity → 0.17 M
Molality → 0.11 m
Explanation:
The student notices that the volume of the solvent does not change when the sucrose dissolves in it; therefore we assume the volume of solvent as solution.
Molarity = Mol of solute/L
Let's calculate the mol of solute (mass / molar mass)
12 g / 342 g/mol = 0.0351 moles
Let's conver the volume (mL) to L
300 mL / 1000 = 0.3 L
Molarity (mol/L) = 0.0351 mol / 0.3L → 0.17 M
Molality = mol of solute / 1kg of solvent.
Let's find out the mass of solvent with the density
Solvent density = Solvent mass / Solvent volume
1.01 g/mL = Solvent mass / 300 mL
1.01 g/mL . 300 mL = Solvent mass →303 g
Let's convert the mass to kg
303 g / 1000 = 0.303 kg
Molality (mol/kg) → 0.0351 mol / 0.303kg = 0.11 m
B.) Positively charged
C.) Strongly ionic
D.) Negatively charged
Answer:
c) 40 (o), 35 (+), 34 (-)
Explanation:
Let us represent the element with P
Given information about the element:
Charge on P = +1
Mass number of P = 75
We can express the atom as ⁴⁵P¹⁺
The positive charge on the atom denotes that the atom has lost an electron. Electrons are negatively charge elementary particles in an atom. Therefore, the number of protons, positively charged particles are now more. This charge imbalance is what leaves atom P with a charge of +1. The difference between the proton number and number of electrons is just 1 and it represents a loss of an electron. Atoms that are not charged have their proton and electron number to be the same. Those that are negatively charge signifies that an electron has been gained and the number of electrons are greater than those of the protons.
The mass number 75 is the number of protons plus neutrons.
Option C gives the following information:
Neutron = 40
Protons = 35
Electrons = 34
Here Protons > Electrons with a difference of 1+.
Mass number = Protons + Neutrons =35 + 40 = 75
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Explanation:
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Answer:
(0,653±0,002) M of HNO₃
Explanation:
The reaction of standarization of HNO₃ with Na₂CO₃ is:
2 HNO₃ + Na₂CO₃ ⇒ 2 Na⁺ + H₂O + CO₂ + 2NO₃⁻
To obtain molarity of HNO₃ we need to know both moles and volume of this acid. The volume is (27,71±0,05) mL and to calculate the moles it is necessary to obtain the Na₂CO₃ moles and then convert these to HNO₃ moles, thus:
0,9585 g of Na₂CO₃ × ( 1 mole / 105,988 g) =
9,043×10⁻³ mol Na₂CO₃ × ( 2 moles of HNO₃ / 1 mole of Na₂CO₃) = 1,809×10⁻² moles of HNO₃
Molarity is moles divide liters, thus, molarity of HNO₃ is:
1,809×10⁻² moles / 0,02771 L = 0,6527 M of HNO₃
The absolute uncertainty of multiplication is the sum of relative uncertainty, thus:
ΔM = 0,6527M× (0,0007/0,9585 + 0,001/105,988 + 0,05/27,71) =
0,6527 M× 2,54×10⁻³ = 1,7×10⁻³ M
Thus, molarity of HNO₃ solution and its absolute uncertainty is:
(0,653±0,002) M of HNO₃
I hope it helps!