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LUCKY_DIMON [66]
2 years ago
7

To completely neutralise 200cm3 of 0.5mol/dm3 sodium hydroxide (NaOH), a student adds 100cm3 of 0.5mol/dm3 sulfuric acid (H2SO4)

. The temperature of the solution goes up by 4.5°C.
The equation for the reaction is



2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l)



a. Calculate the amount, in moles, of NaOH in the sodium hydroxide solution.
Chemistry
1 answer:
OLga [1]2 years ago
6 0

Answer:

0.1 mol

Explanation:

Step 1: Given data

  • Volume of the solution of sodium hydroxide (V): 200 cm³
  • Molar concentration of sodium hydroxide (C): 0.5 mol/dm³

Step 2: Convert "V" to dm³

We will use the conversion factor 1 dm³ = 1000 cm³.

200 cm³ × 1 dm³/1000 cm³ = 0.200 dm³

Step 3: Calculate the moles (n) of NaOH

The molarity of the NaOH solution is equal to the moles of NaOH divided by the volume of solution.

C = n/V

n = C × V

n = 0.5 mol/dm³ × 0.200 dm³ = 0.1 mol

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I think the best statement to fill the blank is that "can be desalinized and used for drinking". The said statement seems the most appropriate one because the pH of saltwater is not 10 but approximately between 7.6 to 8.4. Also, saltwater is not found in glaciers, ice caps and aquifers instead it is freshwater.
8 0
3 years ago
When we react a weak acid with a strong base of equal amounts and concentration, the component of the reaction that will have th
vagabundo [1.1K]

Answer:

d. the conjugate base.

Explanation:

The general reaction of a weak acid, HA, with a strong base YOH, is:

HA + YOH → A⁻ + H₂O + Y⁻

<em>Where A⁻ is the conjugate base of the weak acid and Y⁻ usually is a strong electrolyte.</em>

<em />

That means after he complete reaction you don't have weak acid nor strong base, just conjugate base that will be in equilibrium with water, thus (Strong electrolyte doesn't change pH:

A⁻ + H₂O ⇄ HA + OH⁻

As the equilibrium is producing OH⁻, the pH of the solution is being affected for the conjugate base

Right option:

<h3>d. the conjugate base. </h3>

6 0
3 years ago
Describe the process used to measure out a specific mass of a solid
raketka [301]
Place the solid on an electronic balance. Read the balance reading.
8 0
3 years ago
What is the gram molecular mass of a compound if 5 moles of the compound has a mass of 100 grams?
aivan3 [116]
5 mols = 100 grams
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6 0
3 years ago
Will give brainly if correct
nydimaria [60]

Answer:

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Explanation:

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= 3.4 mol Li2SO4

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