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PolarNik [594]
3 years ago
15

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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In terms of the atmosphere, which of the following best describes the oxygen that is present?
Viktor [21]
The atmosphere is considered homogeneous. It isn’t exactly on the smallest scales but that doesn’t matter. Homogenous means the composition will be the same in any sample taken from the substance. And clearly, the atmosphere is mostly gas. So the last answer is right
6 0
3 years ago
Calculate the second volumes. 51.7 L at 27 C and 90.9 KPa to STP
Arturiano [62]

The second volume : 42.2 L

<h3>Further explanation</h3>

Given

51.7 L at 27 C and 90.9 KPa

Required

The second volume

Solution

STP = P₂=1 atm, T₂=273 K

T₁ = 27 + 273 = 300 K

P₁ = 90.9 kPa = 0,897 atm

Use combine gas law :

P₁V₁/T₁ = P₂V₂/T₂

Input the value :

0.897 x 51.7/300 = 1 x V₂/273

V₂= 42.20 L

6 0
3 years ago
Cuando el oxígeno reacciona con el calcio produce un sólido blanco muy utilizado en la preparación de cementos. ¿Cuál de las sig
8_murik_8 [283]

Answer:

2Ca + O₂ → 2CaO

Explanation:

Cuando el Calcio (Ca) reacciona con oxígeno (O₂) se produce cal (CaO). La cal es un sólido inodoro de color blanco a grisáceo. La cal es un óxido que se encuentra presente en el cemento y su cuantificación permite determinar la calidad y el tipo de cemento a utilizar.

La reacción que describe el proceso anterior es:

Ca + O₂ → CaO

Para balancear los oxígenos, se deben poner 2 CaO como producto:

Ca + O₂ → 2CaO

Para balancear los calcios, se pone como coeficiente del Ca un 2:

<h3>2Ca + O₂ → 2CaO</h3><h3 />

Esta última es la reacción que describe el proceso anterior

6 0
3 years ago
What happens in cellular respiration?
Paha777 [63]

Answer:

Option B

Explanation:

The reaction can be summarized as

6O2+C6H12O6——›6CO2+6H2O+Heat

8 0
2 years ago
Read 2 more answers
Which quantity can be calculated using the equation E=MC^2
r-ruslan [8.4K]

Answer:

The energy needed to split an atom into separate protons, neutrons, and electrons

Explanation:

The equation E = MC^2 is developed by Einstein’s Special Relativity Theory

where,

E = Energy

M = mass

C = speed of the light

The energy should be measured in Joules i.e J

The mass should be measured in Kilogram i.e Kg

And, the speed of the light should be measured in meters per second i.e ms-1

The C should be squared

Now the energy is required to divided into three particles i.e protons, electrons and neutrons

It also needs to allocate the nucleus into distinct protons and neutrons that we called binding energy of nuclear

And if the energy is required to take off an electron from an atom we called the energy of ionization

And if the energy is required to add an electron to an atom so we called it affinity of electron

8 0
3 years ago
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