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Novosadov [1.4K]

3 years ago

14

Give the reason for the following; 1. Iodimetric titrations are usually performed in neutral or mildly alkaline (pH 8) to weakly

acid solution. 2. Iodine solutions are prepared by dissolving I2 in a concentrated solution of potassium iodide. 3. Iodimetric determination of vitamin C is performed rapidly after preparing vitamin C solution

1 answer:

Agata [3.3K]3 years ago

5 0

Answer:

Explanation:

blach bal

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Arrange the following in order of increasing

Reptile [31]

Answer:

Explanation:

The increasing order of energy of electromagnetic radiations is,

Radio wave∠ micro waves ∠ infrared radiations ∠ visible light ∠ ultraviolet ∠ x-rays ∠ gamma rays

1) visible radiation, ultraviolet radiation, infrared radiation, microwaves, x-rays

microwaves ∠ infrared radiation ∠ visible radiation ∠ ultraviolet radiation ∠ x-rays

2) microwaves, ultraviolet radiation, visible radiation, infrared radiation, x-rays

microwaves ∠ infrared radiation ∠ visible radiation ∠ ultraviolet radiation ∠ x-rays

3) microwaves, infrared radiation, visible radiation, ultraviolet radiation, x-rays

microwaves ∠ infrared radiation ∠ visible radiation∠ ultraviolet radiation, ∠ x-rays

4) x-rays, microwaves, visible radiation, infrared radiation, ultraviolet radiation

microwaves ∠ infrared radiation ∠ visible radiation∠ ultraviolet radiation, ∠ x-rays

5) . infrared radiation, visible radiation, ultraviolet radiation, microwaves, x-rays

microwaves ∠ infrared radiation ∠ visible radiation∠ ultraviolet radiation, ∠ x-rays

7 0

3 years ago

If an atom has a mass number of 25 and an atomic number of 11 how many neutrons are there in this atom?

babunello [35]

C. 14
you would subtract the mass number from the protons or the atomic number because in order to find the mass number you would add the protons and neutrons :)

5 0

3 years ago

What would be the pH of an H2SO4 solution if the [H+] = 4.58 x 10-5 moles/liter?

Ghella [55]

Answer: pH of an $H_2SO_4$ solution is 4.34

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

$pH=-\log [H^+]$

$H_2SO_4\rightarrow 2H^++SO_4^{2-}$

Putting in the values:

$pH=-\log[4.58\times 10^{-5}]$

$pH=4.34$

Thus pH of an $H_2SO_4$ solution if the $[H^+]$ is $4.58\times 10^{-5}]$ is 4.34

4 0

3 years ago

Mass = 25g, Volume = 5mL. What is the density? *

Fantom [35]

Answer:

5ml

Explanation:

m/v

25/5=5

means 25÷5=5

6 0

3 years ago

An equilibrium mixture of PCl5(g), PCl3(g), and Cl2(g) has partial pressures of 217.0 Torr, 13.2 Torr, and 13.2 Torr, respective

katovenus [111]

Answer:

The new partial pressures after equilibrium is reestablished:

$PCl_3,p_1'=6.798 Torr$

$Cl_2,p_2'=26.398 Torr$

$PCl_5,p_3'=223.402 Torr$

Explanation:

$PCl_3(g) + Cl_2(g)\rightleftharpoons PCl_5(g)$

At equilibrium before adding chlorine gas:

Partial pressure of the $PCl_3=p_1=13.2 Torr$

Partial pressure of the $Cl_2=p_2=13.2 Torr$

Partial pressure of the $PCl_5=p_3=217.0 Torr$

The expression of an equilibrium constant is given by :

$K_p=\frac{p_1}{p_1\times p_2}$

$=\frac{217.0 Torr}{13.2 Torr\times 13.2 Torr}=1.245$

At equilibrium after adding chlorine gas:

Partial pressure of the $PCl_3=p_1'=13.2 Torr$

Partial pressure of the $Cl_2=p_2'=?$

Partial pressure of the $PCl_5=p_3'=217.0 Torr$

Total pressure of the system = P = 263.0 Torr

$P=p_1'+p_2'+p_3'$

$263.0Torr=13.2 Torr+p_2'+217.0 Torr$

$p_2'=32.8 Torr$

$PCl_3(g) + Cl_2(g)\rightleftharpoons PCl_5(g)$

At initail

(13.2) Torr (32.8) Torr (13.2) Torr

At equilbriumm

(13.2-x) Torr (32.8-x) Torr (217.0+x) Torr

$K_p=\frac{p_3'}{p_1'\times p_2'}$

$1.245=\frac{(217.0+x)}{(13.2-x)(32.8-x)}$

Solving for x;

x = 6.402 Torr

The new partial pressures after equilibrium is reestablished:

$p_1'=(13.2-x) Torr=(13.2-6.402) Torr=6.798 Torr$

$p_2'=(32.8-x) Torr=(32.8-6.402) Torr=26.398 Torr$

$p_3'=(217.0+x) Torr=(217+6.402) Torr=223.402 Torr$

6 0

3 years ago