Answer:
See attachment
Explanation:
The amine group of N,N-dimethylaniline is an electron-donating group and will cause the benzene ring to act as a nucleophile in an electrophilic aromatic substitution reaction with the diazonium salt of sulfanilic acid.
A H2A and OH− A2− and OH−
B HA− and Li+ A2− and Li+
C HA− and OH− HA− and Li+
D H2A and Li+ HA− and OH−
The main components (more than half of the initial amount of H2A, besides H2O) at equivalence point 1 and 2 (EP1), (EP2) is HA⁻ and Li⁺ A²⁻ and Li⁺.
Titration of acid H₂A with LiOH solution.
At first equivalent points are:
H₂A + LiOH → HA⁻ + Li⁺ + H₂O
The Main component at (EP1) => HA⁻ and Li⁺
At second equivalence point are:
HA⁻ + LiOH → A²⁻ + Li⁺ + H₂O
Main component at (EP2) => A²⁻ and Li⁺
Therefore, the correct option is B which is HA− and Li+ A2− and Li+
Find more information about Titration curve here:
Answer:
B) HA⁻ and Li⁺ A²⁻ and Li⁺
Explanation:
Titration of acid H₂A with LiOH solution.
At first equivalent point
H₂A + LiOH → HA⁻ + Li⁺ + H₂O
Main component at (EP1) => HA⁻ and Li⁺
At second equivalence point
HA⁻ + LiOH → A²⁻ + Li⁺ + H₂O
Main component at (EP2) => A²⁻ and Li⁺
Therefore, the correct answer is B
Answer : The mass of evaporated must be, 1.217 kg
Explanation :
First we have to calculate the moles of water.
Molar mass of water = 18 g/mol
Now we have to calculate the heat released.
Heat released = Moles of water × Molar heat of fusion of ice
Heat released = 29.17 mol × 6.01 kJ/mol
Heat released = 175.3 kJ
Now we have to calculate the moles of
Heat = Moles of × Molar heat of vaporization of
175.3 kJ = Moles of × 17.4 kJ/mol
Moles of = 10.07 mol
Now we have to calculate the mass of
Molar mass of = 120.9 g/mol
Thus, the mass of evaporated must be, 1.217 kg
Answer:
Ca₃(AsO₃)₂
Explanation:
Sodium arsenite, with the chemical formula Na₃AsO₃, is formed by the cation Na⁺ and the anion AsO₃³⁻. For the molecule to be neutral, 3 cations Na⁺ and 1 anion AsO₃³⁻ are required.
Calcium arsenite would be formed by the cation Ca²⁺ and the anion AsO₃³⁻. For the molecule to be neutral, we require 3 cations Ca²⁺ and 2 anions AsO₃³⁻. The resulting chemical formula is Ca₃(AsO₃)₂.
Answer:
c. they are all used to diagnose medical conditions
Explanation:
Lactate dehydrogenase, aspartate aminotransfcrase, and creatine kinase all are used to diagnose medical conditions.
b. Positive
c. Neither Negative nor positive
Answer:
Option 5 → 7.01 g
Explanation:
Molarity . volume (L) = Moles
This can help us to determine the moles of KOH that are in the solution.
We convert the volume from mL to L → 250 mL . 1L / 1000mL = 0.250 L
0.5 mol /L . 0.250L = 0.125 moles of KOH
Now, we only have to convert the moles to mass, by the molar mass:
Moles . molar mass = mass → 0.125 mol . 56.1 g/mol = 7.01 g
Answer:
We need 7.01 grams of KOH (option 5)
Explanation:
Step 1: Data given
Volume aqueous KOH solution = 250 mL = 0.250 L
Molarity = 0.500 M
Molar mass of KOH = 56.10 g/mol
Step 2: Calculate moles KOH
Moles KOH = molarity * volume
Moles KOH = 0.500 M * 0.250 L
Moles KOH = 0.125 moles
Step 3: Calculate mass of KOH
Mass KOH = moles KOH * molar mass KOH
Mass KOH = 0.125 moles * 56.10 g/mol
Mass KOH = 7.01 grams
We need 7.01 grams of KOH