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olga2289 [7]
3 years ago
5

Which indicator would be the best to use for a titration between 0.20 m hi with 0.10 m ba(oh)2? you will probably need to consul

t the appropriate table in the book?
Chemistry
2 answers:
Mars2501 [29]3 years ago
8 0
1. alizarin yellow R, color change at pH 10-12
2. thymol blue, color change at pH 2-4
3. methyl red, color change at pH 3-5
4. phenolphthalein, color change at pH 8-10
<span>5. bromothymol blue, color change at pH 6-8

These are the list of indicators that we have to choose from them and the correct answer will be 5) Bromothymol blue, due to color change at pH 6-8
Due to both HI is strong acid and Ba(OH)</span>₂ is strong base so the formed salt BaI₂ will has pH = 7 and the equivalence point will be 7 so it will be in the effective range of Bromothymol blue
serious [3.7K]3 years ago
4 0

The indicator that is used for the endpoint at ${\text{pH}}$ 7 is $$\boxed{{\text{bromothymol blue}}}$$ .

Further Explanation:

<u>Neutralization reaction:</u>

It is the reaction that occurs between an acid and a base in order to form salt and water. It is named so as it neutralizes the excess amount of hydrogen or hydroxide ions present in the solution. It is used to decrease the acidity in the stomach, wastewater treatment, antacid tablets, and to control the pH of soil. An example of a neutralization reaction is,

$${\text{HCl}}+{\text{NaOH}}\to{\text{NaCl}}+{{\text{H}}_2}{\text{O}}$$

The indicator is generally a weak acid or weak base that is utilized to determine the ${\text{pH}}$ change of the solution. An indicator when dissolved in water dissociates into the ions and  give color. Acid-base indicators are used in neutralization reaction.

The titration between HI and $${\text{Ba}}{\left({{\text{OH}}}\right)_{\text{2}}}$$ would result in the following neutralization reaction.

$2{\text{HI}}+{\text{Ba}}{\left( {{\text{OH}}}\right)_2}\to{\text{Ba}}{{\text{I}}_2}+2{{\text{H}}_{\text{2}}}{\text{O}}$

According to the balance reaction, 2 moles of HI is needed to completely neutralize 1 mole of $${\text{Ba}}{\left({{\text{OH}}}\right)_{\text{2}}}$$ .

When the volume of solution is 1 L then the number of moles of HI in 0.20 M solution is 0.20 mol. Also, the number of moles of $${\text{Ba}}{\left({{\text{OH}}}\right)_{\text{2}}}$$ present in 0.10 M is 0.10 mol.

Since 1 mole of $${\text{Ba}}{\left({{\text{OH}}}\right)_{\text{2}}}$$ can completely neutralized 2 moles of HI and give 1 mole of ${\text{Ba}}{{\text{I}}_2}$ , therefore, for 0.10 moles of $${\text{Ba}}{\left({{\text{OH}}}\right)_{\text{2}}}$$  is completely neutralize 0.20 moles of HI and give 0.10 moles of ${\text{Ba}}{{\text{I}}_2}$ . Since it is neutralization reaction and thus the final ${\text{pH}}$ of the solution is 7.

Therefore, the indicator that is used for the endpoint at ${\text{pH}}$ 7 is bromothymol blue that has a ${\text{pH}}$ range from pH 6.0 to 7.6.

Learn more:

1. Some amino acids have “acids” in their name but still, they are basic in aqueous solution why?: <u>brainly.com/question/5050077</u>

2. Determine how many moles of water produce: <u>brainly.com/question/1405182</u>

Answer details:

Grade: Senior school

Subject: Chemistry

Chapter: Acid-base reactions

Keywords: Acids, bases, titrations, pH, number of moles neutratliztion reactions, HI, ba(oh)2, 2 mole and 1 mole.

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Answer:

The heat at constant pressure is -3,275.7413 kJ

Explanation:

The combustion equation is 2C₆H₆ (l) + 15O₂ (g)  → 12CO₂ (g) + 6H₂O (l)

\Delta n_g = (12 - 15)/2 = -3/2

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\Delta H = \Delta U + \Delta n_g\cdot R\cdot T

Where R and T are constant, and ΔU is given we can write the relationship as follows;

H = U + \Delta n_g\cdot R\cdot T

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Therefore, we get;

H = -3,272 kJ + (-3/2) mol ×8.314 J/(mol·K) ×300 K) × 1 kJ/(1000 J) = -3,275.7413 kJ

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Answer: The empirical formula for the given compound is C_5H_7N

Explanation:

The chemical equation for the combustion of compound having carbon, hydrogen, and nitrogen follows:

C_xH_yN_z+O_2\rightarrow CO_2+H_2O

where, 'x', 'y' and 'z' are the subscripts of carbon, hydrogen and nitrogen respectively.

We are given:

Mass of CO_2=21.363mg=21.363\times 10^3g=21363g

Mass of H_2O=6.125g=6.125\times 10^3g=6125g

We know that:

Molar mass of carbon dioxide = 44 g/mol

Molar mass of water = 18 g/mol

For calculating the mass of carbon:

In 44 g of carbon dioxide, 12 g of carbon is contained.

So, in 21363 g of carbon dioxide, \frac{12}{44}\times 21363=5826.27g of carbon will be contained.

For calculating the mass of hydrogen:

In 18 g of water, 2 g of hydrogen is contained.

So, in 6125 g of water, \frac{2}{18}\times 6125=680.55 of hydrogen will be contained.

Now we have to calculate the mass of nitrogen.

Mass of nitrogen in the compound = (7875) - (5826.27 + 680.55) = 1368.18 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Carbon =\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{5826.27g}{12g/mole}=485.52moles

Moles of Hydrogen = \frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{680.55g}{1g/mole}=680.55moles

Moles of Nitrogen = \frac{\text{Given mass of nitrogen}}{\text{Molar mass of nitrogen}}=\frac{1368.18g}{14g/mole}=97.73moles

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0154 moles.

For Carbon = \frac{485.52}{97.73}=4.96\approx 5

For Hydrogen  = \frac{680.55}{97.73}=6.96\approx 7

For Nitrogen = \frac{97.73}{97.73}=1

Step 3: Taking the mole ratio as their subscripts.

The ratio of C : H : N = 5 : 7 : 1

Hence, the empirical formula for the given compound nicotine is C_5H_7N_1=C_5H_7N

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