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olga_2 [115]
3 years ago
8

25 points! Help please

Chemistry
2 answers:
masya89 [10]3 years ago
7 0

Answer:

phase change solid -> liquid

Sedbober [7]3 years ago
4 0

Answer:

I think its b

Explanation:

but I wouldn't depend on this answer

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Malonic acid, h2c3h2o4, is a diprotic acid with ka1= 1.5 x 10-3and ka2= 2.0 x 10-6. what is the concentration of the malonate an
Bess [88]

In a 0.15 m solution of malonic acid, the amount of the malonate anion, c3h2o42-, is 1.68*10^{-4} M.

Explanation:

For the first equlibria;

initial concentration of H_{2}C_{3}H_{2}OH=0.15

initial concentration of HC_{3}H_{2}O_{4}^{-} =0

initial concentration of H^{+} =0

Let concentration change of H_{2}C_{3}H_{2}OH=-x

Let concentration change of HC_{3}H_{2}O_{4}^{-} =+x

Let concentration change of H^{+} =+x

Let concentration in equilibrium state of  H_{2}C_{3}H_{2}OH=0.15-x

Let concentration in equilibrium state ofHC_{3}H_{2}O_{4}^{-} =x

Let concentration in equilibrium state ofH^{+} =x

Therefore, Ka_{1}=\frac{x*x}{0.15-x}=\frac{1.5*10^{-3}}{1} =\frac{x^{2}}{0.15-x}

x^{2}+0.0015x-0.000225=0

Which is a quadratic equation in x, solving it gives;

x=0.01427

Therefore, HC_{3}H_{2}O_{4}^{-} =x= 0.01427M

Now for the second equlibria;

initial concentration of HC_{3}H_{2}O_{4}^{-}=0.01427

initial concentration of C_{3}H_{2}O_{4}^{2-} =0

initial concentration of H^{+} =0

Let concentration change of HC_{3}H_{2}O_{4}^{-}=-x

Let concentration change of  C_{3}H_{2}O_{4}^{2-} =+x

Let concentration change of H^{+} =+x

Let concentration in equilibrium state of  HC_{3}H_{2}O_{4}^{-}=0.01427-x

Let concentration in equilibrium state ofC_{3}H_{2}O_{4}^{2-} =x

Let concentration in equilibrium state ofH^{+} =x

Therefore, Ka_{2}=\frac{x*x}{0.01427-x}=\frac{2.0*10^{-6}}{1} =\frac{x^{2}}{0.01427-x}

2.854*10^{-8}-(2.0*10^{-6})x=x^{2}

Therefore, C_{3}H_{2}O_{4}^{2-} =x= 1.68*10^{-4}M

<h3>What is a malonic acid?</h3>

The chemical formula of malonic acid is CH2(COOH)2. Malonates include the ionized form of malonic acid as well as its esters and salts. For instance, the diethyl ester of malonic acid is called diethyl malonate.

Polyester and polymers both employ malonic acid as a precursor. Both the scent business and the flavoring sector utilize it. It is employed to regulate acidity. Malonic acid contributes to the production of fatty acids in people. Malonic acid has been found in a number of foods outside of the human body, including red beets, corn, scarlet beans, common beets, and cow milks, although its presence has not been defined. The group of organic substances known as dicarboxylic acids and derivatives includes malonic acid, also known as malonate or H2MALO.

To know more about malonic acid, visit:

brainly.com/question/13943912?referrer=searchResults

#SPJ4

4 0
1 year ago
How to find effective nuclear charge
kiruha [24]
The effective nuclear charge is the net positive charge experienced by valence electrons
3 0
3 years ago
carbonate MgCO3, reacts with nitric acid, HNO3, to form magnesium nitrate and carbonic acid. Carbonic acid reacts to form water
Alenkasestr [34]
Most likely the carbonic acid im guessing H2CO3 undergoes thermal decomposition 

H2CO3 ===> H2O + CO2

hope that helps
4 0
3 years ago
What are the main tybes of mixture​
Valentin [98]

Explanation:

The main types of mixture are <em>homogeneous mixture and heterogeneous mixture </em><em>.</em>

4 0
3 years ago
You need to make an aqueous solution of 0.223 M barium bromide for an experiment in the lab, using a 250 mL volumetric flask. Ho
kow [346]

Answer:

16.566g

Explanation:

The 0.223M barium bromide means there are 0.223 moles of barium bromide is 1000ml of barium bromide solution.

Now, we firstly need to know the number of moles in 250ml

And that is = (0.223 * 250)/1000 = 0.05575 mole

Now we need to know the amount in g of barium bromide to add.

From the relation : mass = number of moles * molar mass.

The molar mass of barium bromide is 297.14g/mol

mass = 297.14 * 0.05575 = 16.566g

8 0
3 years ago
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