Is waterproof sun lotion polar or no polar

The weak acid HA is 4 % ionized (dissociated) in a 0.30 M solution. A. What is Ka for this acid?B. What is the pH of this soluti

ANTONII [103]

Answer:

$Ka=5x10^{-4}$

$pH=1.92$

Explanation:

Hello,

In this case, given the percent ionization and the concentration of the acid, one computes the concentration of hydrogen ions as follows:

$\% ionization=\frac{[H^+]}{[HA]}*100\%$

$[H^+]=\frac{\% ionization*[HA]}{100\%} =\frac{4\%*0.30M}{100\%}=0.012M$

Therefore the Ka is computed by using the equilibrium expression:

$Ka=\frac{[H^+][A^-]}{[HA]} =\frac{0.012M*0.012M}{0.30M-0.012M}\\ \\Ka=5x10^{-4}$

And the pH:

$pH=-log([H^+])=-log(0.012)\\\\pH=1.92$

Regards.

4 0

3 years ago

If a substance is covalent, then it likely will

svet-max [94.6K]

Answer : If a substance is covalent, then it is likely to melt easily and fast, it may be composed of two or more non-metals which share a covalent bonding between them and it will not conduct electricity.

It is seen that covalent substances are made up of two or more non-metals which share a covalent bond between them. They are found to melt easily and when dissolved in water they are seen to be insoluble. They are also not good conductors of electricity as there is no free electron available to conduct electricity.

4 0

3 years ago

Read 2 more answers

2.00 L of a gas is collected at 25.0°C and 745.0 mmHg. What is the volume at 760.0 mmHg

Leviafan [203]

1.7960L

Explanation:

the mass of the gas is constant in both instances

pv/T=constant(according to pv=nRT)

745mmHg*2L/298K=760mmHg*v/273K

v=1.7960L

5 0

3 years ago

When the following equation is balanced with lowest whole-number coefficients, what is the coefficient for NO(g)? ___NH3(g) + __

inn [45]

Answer:

Coefficient in front of the $NO$ in the balanced equation - 4

Explanation:

The unbalanced reaction is shown below as:-

$NH_3+O_2\rightarrow NO+H_2O$

On the left hand side,

There are 1 nitrogen atom and 3 hydrogen atoms and 3 oxygen atoms

On the right hand side,

There are 1 nitrogen atom and 2 hydrogen atoms and 2 oxygen atoms

Thus,

Right side, $H_2O$ must be multiplied by 6 and $NO$ by 4

Left side, $O_2$ is multiplied by 5 and $NH_3$ by 4 so to balance the whole reaction.

Thus, the balanced reaction is:-

$4NH_3+5O_2\rightarrow 4NO+6H_2O$

<u>Coefficient in front of the $NO$ in the balanced equation - 4</u>

5 0

3 years ago

Rate law equation The rate of a chemical reaction depends on the concentrations of the reactants. For the general reaction betwe

shusha [124]

Answer: The reaction order with respect to A is m

Explanation:

Order of the reaction is defined as the sum of the concentration of terms on which the rate of the reaction actually depends. It is the sum of the exponents of the molar concentration in the rate law expression.

Elementary reactions are defined as the reactions for which the order of the reaction is same as its molecularity and order with respect to each reactant is equal to its stoichiometric coefficient as represented in the balanced chemical reaction.

For the given reaction:

$aA+bB\rightleftharpoons cC+dD$

$Rate=k[A]^m[B]^n$

In this equation, the order with respect to each reactant is not equal to its stoichiometric coefficient which is represented in the balanced chemical reaction.

Hence, this is not considered as an elementary reaction.

Order with respect to A = m

Order with respect to B = n

Overall order = m+n

Thus order with respect to A is m.

3 0

3 years ago