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ratelena [41]
3 years ago
8

Why should distilled water be used when conducting chemical tests?

Chemistry
1 answer:
pishuonlain [190]3 years ago
8 0

Explanation:

Water is used in many tests as solvent for dissolving solutes.

No ions, compounds or salts are present in distilled water. Therefore, test result will not be affected by distilled water.

If plain water is used instead of distilled water, the ions or other salts present in plain water, may undergo chemical reaction with the reagent and may affect the test result.

Consider an example,

Concentration of Fe^{2+} is determined by potassium permanganate using titration method

solution of both Fe^{2+} and potassium permanganate are made in water.

Potassium permanganate is titrant and Fe^{2+} is used as titrand.

Concentration of Fe^{2+} is determined by end point. if the water used for making solution is not distilled, it may affect end point, which results in incorrect determination of concentration of Fe^{2+}.

Therefore, distilled should be used for chemical tests.

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For this reaction, C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ. If two moles of C3H8(g) reacted with excess oxygen,
BartSMP [9]

A) 4400 kj of heat released into surroundings

<h3>Further explanation</h3>

Reaction

C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ

Reaction exothermic( ∆H=-, released heat to surrounding) and for combustion of 1 mole of C3H8

So for two moles of C3H8, the enthalpy :

\tt -2200\times 2=-4400~kJ

7 0
3 years ago
5. A 180 mL disinfectant solution contains 85 mL of isopropyl alcohol. Determine the V/V
lyudmila [28]

The % V/V concentration of a 180-mL disinfectant solution containing 85 mL of isopropyl alcohol is 47 % V/V.

<h3>What is the % V/V concentration?</h3>

It refers to the milliliters of solute for every 100 milliliters of solution.

We have 180 mL of a disinfectant solution that contains 85 mL of isopropyl alcohol (solute).

The % V/V concentration of this solution is:

% V/V = (mL solute/mL solution) × 100% =

% V/V = (85 mL/180 mL) × 100% = 47% V/V

Learn more about % V/V here: brainly.com/question/17055828

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7 0
2 years ago
In the reaction 2co ( g) + o2( g) → 2co2( g), what is the ratio of moles of oxygen used to moles of co2produced?
KIM [24]
In the reaction 2co ( g) + o2( g) → 2co2( g), the ratio of moles of oxygen used to moles of co2produced is 1:2.
8 0
3 years ago
A single covalent bond is made up of​
SIZIF [17.4K]

Answer:

In chemistry, a single bond is a chemical bond between two atoms involving two valence electrons. That is, the atoms share one pair of electrons where the bond forms. Therefore, a single bond is a type of covalent bond.

Explanation:

(copied from Google)

4 0
3 years ago
26 g of zinc combines with 12.8 g of sulfur. What is the empirical formula of zinc sulfide?
Alisiya [41]
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Empircal formula: ZnS

The answer is C
7 0
3 years ago
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