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3 years ago

How can indicator be used to determine if a solution is an acid or base

Chemistry

1 answer:

dalvyx [7]3 years ago

8 0

Answer:

To tell if something is an acid or a base, you can use a chemical called an indicator. An indicator changes color when it encounters an acid or base. There are many different types of indicators, some that are liquids and others that are concentrated on little strips of "litmus" paper.

Explanation:

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Copper metal (Cu) reacts with silver nitrate (AgNO3) in aqueous solution to form Ag and Cu(NO3)2. The balanced chemical equation

mars1129 [50]

107.9 g of Ag is produced from a reaction of 31. 75 gram of Copper.

<h3>How we calculate mass from the moles?</h3>

Mass of any substance will be calculated from its moles as:

n = W/M, where

W = required mass

M= molar mas

Given chemical reaction is:

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

From the stoichiometry of the reaction, it is clear that:

1 mole of Cu = produce 2 moles of Ag

Given mass of Cu = 31.75g

Molar mass of Cu = 63.5g/mol

Moles of Cu = 31.75g / 63.5g/mol = 0.5 moles

0.5 moles of Cu = produce 2×0.5 = 1 mole of Ag

Molar mass of Ag = 107.9g/mol

Required mass of Ag = 1mol × 107.9g/mol = 107.9 g

Hence, option (2) is correct i.e. 107.9 g of Ag is produced.

To know more about moles, visit the below link:

https://brainly.in/question/148570

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2 years ago

How many valence electrons does a helium atom have? what is the formula of the ion formed when potassium achieves noble-gas elec

OlgaM077 [116]

> How many valence electrons does a helium atom have?

The electron configuration of Helium is simply 1s2. We see that its outermost shell is the s shell and it contains 2 electrons, therefore the number of valence electrons is also 2.

> What is the formula of the ion formed when potassium achieves noble-gas electron configuration?

Potassium has a electron configuration of [Ar] 4s1. To have an electron configuration of only [Ar] which is a noble gas, the one electron from 4s1 should be removed, hence:

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3 years ago

In which of the substances in Figure 3-1 are the forces of attraction among the particles so weak that they can be ignored under

yawa3891 [41]

Substance C can be compared with gaseous particles in which intermolecular forces are so weak because particles are far from each other.
Hence option C is correct.

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3 years ago

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What is the molarity of an HCl solution if 43.6 mL of a 0.125 M NaOH solution are needed to titrate a 25.0 mL sample of the acid

Sveta_85 [38]

Answer: The molarity of an HCl solution is 0.218 M if 43.6 mL of a 0.125 M NaOH solution are needed to titrate a 25.0 mL sample of the acid.

Explanation:

Given: $V_{1}$ = 43.6 mL, $M_{1}$ = 0.125 M

$V_{2}$ = 25.0 mL, $M_{2}$ = ?

Formula used to calculate the concentration of acid is as follows.

$M_{1}V_{1} = M_{2}V_{2}$

Substitute the values into above formula.

$M_{1}V_{1} = M_{2}V_{2}\\0.125 M \times 43.6 mL = M_{2} \times 25.0 mL\\M_{2} = 0.218 M$

Thus, we can conclude that the molarity of an HCl solution is 0.218 M if 43.6 mL of a 0.125 M NaOH solution are needed to titrate a 25.0 mL sample of the acid.

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3 years ago

Which is the best example of the law of conservation of energy?

asambeis [7]

Answer:

The answer is B. A rolling skateboard slows down because some of its kinetic energy changes to heat.

Explanation:

The law of conservation says energy cant be created or destroyed .Which basically eliminates all of them except b. It can only be transferred

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3 years ago

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