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3 years ago

During the titration of a weak acid and a strong base, you would expect the ph at the endpoint of titration to be ____.

Chemistry

2 answers:

riadik2000 [5.3K]3 years ago

8 0

Answer is: b. more than 7.

The endpoint is the point at which the indicator changes colour in a colourimetric titration and that is point when titration must stop.

For example, basic salt sodium acetate CH₃COONa is formed from the reaction between weak acid (in this example acetic acid CH₃COOH) and strong base (in this example sodium acetate NaOH).

Balanced chemical reaction of acetic acid and sodium hydroxide:

CH₃COOH(aq) + NaOH(aq) → CH₃COONa(aq) + H₂O(l).

Neutralization is is reaction in which an acid (in this example vinegar or acetic acid CH₃COOH) and a base react quantitatively with each other.

Masja [62]3 years ago

8 0

Answer: The correct answer is Option b.

Explanation: pH is the measure of acidity of basicity of the solution. It is basically known as power of hydrogen ion concentration. pH is the negative logarithmic of hydrogen ion concentration.

Mathematically,

$pH=-\log[H^+]$

More the hydrogen ion concentration, low is the pH and more acidic is the solution and vice-versa.

pH scale is from 0 to 14.

Acidic solutions vary from pH 0 to 6.9

Basic solutions vary from pH 7.1 to 14.

Neutral solution has a pH of 7.

For the reaction of weak acid (near to 7) and strong base (far from 7), the final pH will be far from 7 or more than 7. Hence, the pH of final solution will be more than 7 and will be basic in nature.

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The longest wavelength of light with enough energy to break the Cl-Cl bond in Cl2(g) is 495 nm.

Katen [24]

Explanation:

The longest wavelength of light with enough energy to break the Cl-Cl bond = 495 nm = $495\times 10^{-9} m$

1) The frequency of the light:

$\lambda =495\times 10^{-9} m$

$\nu=\frac{c}{\lambda }$

c = speed of light= $3\times 10^8 m/s$

$\nu=\frac{3\times 10^8 m/s}{495\times 10^{-9} m}$

$=6.0606\times 10^{14) s^{-1}$

The frequency of the light is $6.0606\times 10^{14) s^{-1}$ .

2)The energy of a photon of the light:

The energy of the photon is given by : E

$E=h\nu$

h = Planck's constant = $6.626\times 10^{-34} J/s$

$E=6.626\times 10^{-34} J/s\times 6.0606\times 10^{14) s^{-1}$

$=4.016\times 10^{-19} J$

The energy of a photon of the light is $4.016\times 10^{-19} J$ .

3) The minimum energy of the Cl-Cl bond :

To break single bond of Cl-Cl bond we need energy E= $4.016\times 10^{-19} J$

1 mole = $N_A=6.022\times 10^{23} mol^{-1}$

So, in order to break 1 mole of Cl-Cl bond we will need:

$E\times N_A=4.016\times 10^{-19} J\times 6.022\times 10^{23} mol^{-1}$

$=241,828.92 J/mol=241,828.92\times 0.001 kJ/mol=241.83 kJ/mol$

The minimum energy of the Cl-Cl bond is 241.83 kJ/mol.

3 0

3 years ago

How many liters would 4.56 mol sulfur dioxide occupy at STP?

algol13

The volume of Sulfur dioxide-SO₂ at STP : = 102.144 L

<h3>Further explanation</h3>

Given

4.56 mol Sulfur dioxide-SO₂

Required

The volume

Solution

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

so for 4.56 mol :

= 4.56 x 22.4 L

= 102.144 L

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3 years ago

What is gold atomic number

Korolek [52]

Answer:

Explanation:

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In which cell structure does MOST of the process of cellular respiration take place?

ahrayia [7]

Mitochondria are rod-shaped organelles are basically considered the power producers of the cell, it converts oxygen and nutrients into adenosine triphosphate or ATP, which is the chemical energy,also known as "currency" of the cell which powers the metabolic actions of the cell. This process is called aerobic respiration and it is the reason animals breathe oxygen. Cellular repiration happens in the mitochodrion. The 3 phases of cellular respiration are Krebs Cycle, Electron Transport and Glycolysis (Fermentation). Glycolysis takes place in the cytoplasm while the Krebs cycle and electron transport take place in the mitochondria.

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3 years ago

In an electroplating apparatus, where does the reduction reaction occur?

Ludmilka [50]

Answer:

on the surface of the cathode

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1 year ago