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3 years ago

The magnetic field of Erth protects life against

Chemistry

1 answer:

VikaD [51]3 years ago

8 0

Answer:

The field protects life on our planet because it deflects charged particles fired from the sun known as 'solar wind'..

Explanation:

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The pH of a 0.78M solution of 4-pyridinecarboxylic acid HC6H4NO2is measured to be 2.53.Calculate the acid dissociation constant

nika2105 [10]

Answer : The value of acid dissociation constant is, $1.1\times 10^{-5}$

Solution : Given,

Concentration pyridinecarboxylic acid = 0.78 M

pH = 2.53

First we have to calculate the hydrogen ion concentration.

$pH=-\log [H^+]$

$2.53=-\log [H^+]$

$[H^+]=2.95\times 106{-3}M$

Now we have to calculate the acid dissociation constant.

The equilibrium reaction for dissociation of (weak acid) is,

$HC_6H_4NO_2\rightleftharpoons C_6H_4NO_2^-+H^+$

initially conc. 0.78 0 0

At eqm. (0.78-x) x x

The expression of acid dissociation constant for acid is:

$k_a=\frac{[C_6H_4NO_2^-][H^+]}{[C_6H_4NO_2]}$

As, $[H^+]=[C_6H_4NO_2^-]=x$

So, $x=2.95\times 106{-3}M$

Now put all the given values in this formula ,we get:

$k_a=\frac{(x)\times (x)}{(0.78-x)}$

$k_a=\frac{(2.95\times 106{-3})\times (2.95\times 106{-3})}{(0.78-2.95\times 106{-3})}$

$K_a=1.1\times 10^{-5}$

Therefore, the value of acid dissociation constant is, $1.1\times 10^{-5}$

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4 years ago

Which is true of a solute dissolved in a solvent?

Elza [17]

The solute increased to the boiling point of the solvent. In shorter terms it's raising to the boiling point.

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4 years ago

Read 2 more answers

Write a balanced equation for the following:

Ket [755]

(ANS1)— P4 + 5O2 ---> 2P2O5

(ANS2)— C3H8 + 5O2---> 3CO2 + 4H20

(ANS3)— Ca2Si + 4Cl2 ---> 2CaCl2 + SiCl4

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3 years ago

which part of the mushroom gathers nutrients from the soil or dead material that the mushroom is decomposing?

OleMash [197]

Answer:

The Mycelium is usually hidden in the soil, in wood, or another food source. A Mycelium may fill a single ant or cover many acres.

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3 years ago

How do you write the balanced equation for strontium hydroxide and zirconium (I) perchlorate

Andrei [34K]

The law of conservation of mass states that the mass of a system must remain constant everytime, it can neither be created or destroyed. This means the number of atoms of each element on reactant side must equal the number of atoms of each element on product side.

First we figure out the chemical formula for each compound by taking advantage of oxidation states which are able to tell us whether an element will lose or gain an electron

Strontium hydroxide?

Sr is an alkaline earth metal which has 2 valence electrons that when both are lost it has an oxidation state of +2. Since we know the hydroxide ion has a charge of -1, $-_{OH}$ , Then two $-_{OH}$ are needed to form compound, hence we have $SrOH_2$

zirconium (I) perchlorate?

The oxidation state of zirconium is +1 since it is stated that we have zirconium(I). Converserly, perchlorate has a -1 charge which further proves that zirconium has a +1 oxidation state

The product would have a strontium diperchlorate because we know from earlier that Sr has a +2 oxidation state, and we would also have ZrOH because Zr has a +1 oxidation state and $-_{OH}$ has a -1 charge

The unbalanced equation with all chemicals formulas would be

$SrOH_2_(s) + ZrClO^{-} _4(aq) ==> Sr(ClO^{-} _4)_2(aq) + ZrOH(aq)$

Using the law of conservation of mass, it is clear that there is 1 molecule of $ClO^{-} _4$ on reactant side as compared to 2 molecules of $ClO^{-} _4$ on product side. On the other hand, the are 2 molecules of $-_{OH}$ on reactant side and 1 molecule of $-_{OH}$ on product side. To balance we add a coefficient of 2 on $ZrClO_4$ and a coefficient of 2 on ZrOH,

$SrOH_2_(s) + 2ZrClO_4_(aq) ==> Sr(ClO_4)_2_(aq) + 2ZrOH(aq)$ .

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3 years ago