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riadik2000 [5.3K]
3 years ago
8

Any help?

Chemistry
1 answer:
lutik1710 [3]3 years ago
5 0

Answer:

pH = 9.475

Explanation:

Hello there!

In this case, according to the basic ionization of the hydroxylamine:

HONH_2+H_2O\rightarrow HONH_3^++OH^-

The resulting equilibrium expression would be:

Kb=\frac{[HONH_3^+][OH^-]}{[HONH_2]} =1.1x10^{-8}

Thus, we first need to compute the initial concentration of this base by considering its molar mass (33.03 g/mol):

[HONH_2]_0=\frac{1.34g/(33.03g/mol)}{0.500L} =0.0811M

Now, we introduce x as the reaction extent which provides the concentration of the hydroxyl ions to subsequently compute the pOH:

1.1x10^{-8}=\frac{x^2}{0.0811-x}

However, since Kb<<<<1, it is possible to solve for x by easily neglecting it on the bottom to obtain:

x=[OH^-]=\sqrt{1.1x10^{-8}*0.0811}= 2.99x10^{-5}

Thus, the pOH is:

pOH=-log(2.99x10^{-5})=4.525

And the pH:

pH=14-4.525\\\\pH=9.475

Regards!

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5 0
3 years ago
What is the mass sample of 0.0500 moles of zinc chloride ?
vlabodo [156]

Answer:

6.82g

0.59moles

Explanation:

1. What is the mass sample of 0.0500 moles of zinc chloride ?

Given parameters:

Number of moles ZnCl₂ = 0.05moles

Unknown:

Mass of the sample  =  ?

Solution:

To find the mass of a substance using the number of moles, it would be pertinent to understand what mole is.

A mole is a substance that contains the avogadro's number of particles.

It relates to the mass using the expression below;

                Mass of a substance  = number of moles x molar mass

Molar mass of  ZnCl₂;

        Atomic mass of Zn  = 65.4g/mol

                                   Cl = 35.5g/mol

Molar mass = 65.4 + 2(35.5)  = 136.4g/mole

Mass of a substance  = 0.05 x 136.4  = 6.82g

2. How many moles of potassium sulfide are in a 65.50g sample?

Given parameters:

Mass of K₂S  = 65.5g

Unknown:

Number of moles  = ?

Solution:

The number of moles of any substance is related to mass using the expression below;

              Number of moles  = \frac{mass}{molar mass}

Molar mass of K₂S  = 2(39) + 32  = 110g/mol

              Number of moles  = \frac{65.5}{110}   = 0.59moles

8 0
3 years ago
If the ionization constant of water, kw, at 40°c is 2.92 × 10-14, then what is the hydronium ion concentration and ph for an aci
charle [14.2K]

Answer is: the hydronium ion concentratio is 1.71×10⁻⁷ mol/dm³ and pH<6.76.

The Kw (the ionization constant of water) at 40°C is 2.94×10⁻¹⁴ mol²/dm⁶ or 2.94×10⁻¹⁴ M².

Kw = [H₃O⁺] · [OH⁻].

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pH = -log(1.71×10⁻⁷ M).

pH = 6.76.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.

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