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aev [14]
3 years ago
5

Some of the following salts are used in detergents and other cleaning materials because they produce basic solutions. Which of t

he following could not be used for this purpose? Write equations to justify your answers.
a. Sodium carbonate
b. Sodium sulfate
c. Ammonium sulfate
d. Sodium phosphate
Chemistry
1 answer:
Ne4ueva [31]3 years ago
3 0

Answer: Sodium sulfate and Ammonium sulfate could not be used for this purpose.

Explanation:

An acidic solution will show a pH in the range of 0 - 6.9. A basic solution show a pH in the range of 7.1 - 14. A neutral solution will show a pH of 7.

A salt is acidic, when it is formed from the combination of strong acid and weak base. A salt is basic, when it is formed from the combination of weak acid and strong base. A salt is neutral, when it is formed from the combination of weak acid and weak base or strong acid and strong base.

a. Sodium carbonate : is formed by the combination of strong base NaOH and a weak acid H_2CO_3[, thus forms a basic solution.

Na_2CO_3\rightarrow 2Na^++CO_3^{2-}

b. Sodium sulfate:  is formed by the combination of strong base NaOH and a strong acid H_2SO_4[, thus forms a neutral solution.

Na_2SO_4\rightarrow 2Na^++SO_4^{2-}

c. Ammonium sulfate:  is formed by the combination of weak base NH_4OH and a strong acid H_2SO_4[, thus forms a acidic solution.

(NH_4)_2SO_4\rightarrow 2NH_4^++SO_4^{2-}

d. Sodium phosphate:  is formed by the combination of strong base NaOH and a weak acid H_3PO_4[, thus forms a basic solution.

Na_3PO_4\rightarrow 3Na^++PO_4^{3-}

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11111nata11111 [884]

Answer:

3. 116.5 V

4. 119.6 V

Explanation:

3. Determination of the voltage.

Resistance (R) = 25 Ω

Current (I) = 4.66 A

Voltage (V) =?

V = IR

V = 4.66 × 25

V = 116.5 V

Thus, the voltage is 116.5 V

4. Determination of the voltage.

Current (I) = 9.80 A

Resistance (R) = 12.2 Ω

Voltage (V) =?

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V = 119.6 V

Thus, the voltage is 119.6 V

4 0
3 years ago
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Firdavs [7]

Answer: a) 2K_2CrO_4+3Na_2SO_3+10HCl\rightarrow 4KCl+3Na_2SO_4+2CrCl_3+5H_2O

b) 1 mole of SO_2 is produced.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The skeletal equation is:

K_2CrO_4+Na_2SO_3+HCl\rightarrow KCl+Na_2SO_4+CrCl_3 +H_2O

The balanced equation will be:

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Thus the coefficients are 2, 3 , 10 , 4 , 3 , 2 and 5.

b) Oxidation: 2I-^-\rightarrow I_2+2e-^-

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Net reaction:  2I-^-+SO_4^{2-}+4H^+\rightarrow I_2+SO_2+2H_2O

When 1 mole of I_2 is produced, 1 mole of SO_2 is produced.

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the slower person is moving 33.3 meters in 25 seconds, while the other person is moving 66.6 meters in 25 seconds

slower person moved 33.3/25 = 1.332 meters per second.

faster person moved 66.6/25 = 2.664 meters per second.

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