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3 years ago

7

What is the solutions pOH?

1 answer:

maksim [4K]3 years ago

3 0

Answer:

d

Explanation:

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A 44.0 ml volume of 0.25 m hbr is titrated with 0.50 m koh. calculate the ph after addition of 22.0 ml of koh at 25 ∘c.

Helga [31]

The reaction between KOH and HBr is as follows ;
KOH + HBr ---> H₂O + KBr
Stoichiometry of base to acid is 1:1 molar ratio
Both are strong acid and strong base therefore complete ionization takes place
The number of KOH moles added - 0.50 M / 1000 mL/L x 22 mL = 0.011 mol
the number of HBr moles - 0.25 M /1000 mL/L x 44 mL = 0.011 mol
the number of H⁺ ions and OH⁻ ions are equal therefore the whole amount of acid has been completely neutralised by base.
No remaining acid nor base, therefore solution is neutral.
pH = 7
thats the pH value for a neutral solution

4 0

4 years ago

All atoms of the same element:

34kurt

Answer:

have the same number of protons

Explanation:

Atoms of the same element will always have the same number of protons.

Protons are the positively charged particles in an atom which are located in the nucleus.

To recognize an atom, the number of protons is used.
The number of protons is the atomic number.
On the periodic table, atoms are arranged based on the number of protons.

7 0

3 years ago

4. Calculate the Density of a rectangular prism made of metal the dimensions of the prism are 5 cm by 4cm by 5cm. the metal has

uysha [10]

The answer is
4cm by 5cm x7cm =6cm

6 0

3 years ago

At a certain temperature the vapor pressure of pure heptane (C_7 H_16) is measured to be 170. torr. Suppose a solution is prepar

steposvetlana [31]

Explanation:

The given data is as follows.

Pressure (P) = 170 torr, mass of heptane (m) = 86.7 g

First, we will calculate the number of moles as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{86.7 g}{100 g/mol}$

= 0.867 mol

Now, the number of moles of $CH_{3}COBr$ are calculated as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{125}{122.9}$

= 1.07

Therefore, mole fraction of heptane will be calculated as follows.

Mole fraction = $\frac{\text{moles of heptane}}{\text{total moles}}$

= $\frac{0.867}{0.867 + 1.07}$

= $\frac{0.867}{1.937}$

= 0.445

Now, we will calculate the partial pressure of heptane as follows.

$P_{A} = x_{A}P^{o}_{A}$

= $170 \times 0.445$

= 75.65 torr

Thus, we can conclude that the partial pressure of heptane vapor above this solution is 75.65 torr.

8 0

4 years ago

Na: 1s22sC2pP3s<br> C=<br> D=<br> E=

KengaRu [80]

Answer

1s22s22p63s1

Explanation:

5 0

3 years ago