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adelina 88 [10]
4 years ago
7

Assuming 100% dissociation, calculate the freezing point and boiling point (in °C) of a solution with 83.6 g of AgNO 3 in 1.00 k

g of water.
Chemistry
1 answer:
Thepotemich [5.8K]4 years ago
3 0

Answer:

  • <u>Freezing point: - 1.83ºC</u>
  • <u>Boiling point: 100.50ºC</u>

Explanation:

The <em>freezing point</em> and<em> boiling point</em> of solvents, when a solute is added, will change accordingly to the concentration of the solute particles.

The freezing point will decrease and the boiling point will increase. These are two colligative properties.

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<u>Find attached the file with the whole answer, as the site is not uploading the answer in here.</u>

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The pH of saliva is normally in the range of 6.4 to 7.0. However, when a person is ill, the person's saliva becomes more acidic.
Firlakuza [10]

<u>Answer:</u> The hydrogen ion concentration of his saliva is 7.94\times 10^{-7}M

<u>Explanation:</u>

pH is defined as the negative logarithm of hydrogen ion concentration present in the solution.

To calculate the pH of the solution, we use the equation:

pH=-\log[H^+]

We are given:

pH of the saliva = 6.1

Putting values in above equation, we get:

6.1=-\log[H^+]

[H^+]=10^{-6.1}=7.94\times 10^{-7}M

Hence, the hydrogen ion concentration of his saliva is 7.94\times 10^{-7}M

5 0
3 years ago
A mixture of CO (g) and excess O2(g) is placed in a 1.0 L reaction vessel at 100.0C and a total pressure of 1.50 atm. The CO is
umka2103 [35]

Answer:

Partial pressure of of CO₂ in the product mixture is 0,20atm

Explanation:

The balance equation is:

2CO(g) + O₂(g) → 2CO₂(g)

Total pressure of CO(g) and O₂(g) gases before reaction at 100,0°C and 1,0L is 1,50 atm. You can say:

X₁ + Y₁  = 1,50atm <em>(1)</em>

Where X₁ is initial partial pressure CO and Y₁ is initial partial pressure of O₂

After reaction partial pressures are:

X₂ = X₁ - 2n = 0; <em>2n = X₁</em>

Y₂ = Y₁ - n

Z₂ = 2n

Where Z₂ is final partial pressure of CO₂

After reaction pressure at 100,0°C and 1,0L is 1,40 atm, that means:

1,40 atm = (Y₂ + Z₂)

1,40 atm = Y₁ - n + 2n

1,40atm = Y₁ + n

1,40 atm = Y₁ + X₁/2 <em>(2)</em>

Replacing (1) in (2)

1,40 atm = 1,50atm - X₁ + X₁/2

-0,10 atm = - X₁/2

<em>0,20 atm = X₁</em>.

As 2n = X₁; 2n =<em> Z₂ = 0,20 atm</em>

I hope it helps!

7 0
3 years ago
What is the ph of a soft drink in which the major buffer ingredients are 6.6 g of nah2po4 and 8.0 g of na2hpo4 per 355 ml of sol
Volgvan
First, we need to get the concentration of  [NaH2PO4]:
[NaH2PO4] =( mass / molar mass ) * volume L
when we have mass NaH2PO4 = 6.6 g & molar mass = 120g/mol & V = 0.355 L
So by substitution:
[NaH2PO4] = (6.6g / 120g/mol) * 0.355 L = 0.0195 M

then, we need to get the concentration of [Na2HPO4]:
[Na2HPO4]= (mass / molar mass ) * volume L
So by substitution:
[Na2HPO4] = (8g/ 142g/mol) * 0.355 L = 0.02 M

and when Pka of the 2nd ionization of phosphoric acid = 7.21 
So by substitution in the following formula, we can get the PH:

PH = Pka + ㏒[A]/[AH]

∴PH = 7.21 + ㏒[0.02]/[0.0195]
∴ PH = 7.2
4 0
4 years ago
ice _______________ - a collective term for several mechanical weathering processes induced by stresses created by the freezing
elena-14-01-66 [18.8K]

Answer: Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice.

6 0
3 years ago
What is the difference between covalent bonding and electrovalent bonding​
Rudiy27

Answer:

1 ) Electrovalent compounds are formed by the complete transfer of electrons while covalent compounds are formed by sharing of electrons between 2 atoms.

2) Electrovalent compounds are more soluble in polar solvents like water while covalent compounds are more soluble in non-polar solvents like methane.

5 0
3 years ago
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