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3 years ago

An element has an atomic number of 30. How many protons and electrons are in a neutral atom of the element?

Chemistry

1 answer:

anygoal [31]3 years ago

7 0

<span>30 protons, 30 electrons is your answer!:)</span>

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The pH of a solution is 8.83±0.048.83±0.04 . What is the concentration of H+H+ in the solution and its absolute uncertainty?

slava [35]

Answer:

The concentration of $H^{+}$ is 1.48 × $10^{-9}$ M

The absolute uncertainty of $[{H^{+}]$ is ±0.12 × $10^{-9}$ M

The concentration of $H^{+}$ is written as 1.48(±0.12) × $10^{-9}$ M

Explanation:

The pH of a solution is given by the formula below

pH = $-log_{10}[{H^{+}]$

∴ $[H^{+}] = 10^{-pH}$

where $[{H^{+}]$ is the $H^{+}$ concentration

From the question,

pH = 8.83±0.04

That is,

pH =8.83 and the uncertainty is ±0.04

First, we will determine $[{H^{+}]$ from

$[H^{+}] = 10^{-pH}$

$[{H^{+}] = 10^{-8.83}$

$[{H^{+}] = 1.4791$ × $10^{-9}$ M

$[{H^{+}] = 1.48$ × $10^{-9}$ M

The concentration of $H^{+}$ is 1.48 × $10^{-9}$ M

The uncertainty of $[{H^{+}]$ ( $U_{[H^{+}] }$ ) from the equation $[H^{+}] = 10^{-pH}$ is

$U_{[H^{+}] } = 2.303 \\$ × ${[H^{+}] }$ × $U_{pH }$

Where $U_{[H^{+}] }$ is the uncertainty of $[{H^{+}]$

$U_{pH }$ is the uncertainty of the pH

Hence,

$U_{[H^{+}] }$ = 2.303 × 1.4791 × $10^{-9}$ × 0.04

$U_{[H^{+}] }$ = 1.36 × $10^{-10}$ M

$U_{[H^{+}] }$ = 0.12 × $10^{-9}$ M

Hence, the absolute uncertainty of $[{H^{+}]$ is ±0.12 × $10^{-9}$ M

6 0

4 years ago

Is Household Paint a pure substance, or a mixture?

luda_lava [24]

House hold paint is a pure substance hope this helps :)

8 0

3 years ago

What defines an Arrhenius base?

lianna [129]

Answer:

An Arrhenius base is a compound that increases the OH − ion concentration in aqueous solution. The reaction between an Arrhenius acid and an Arrhenius base is called neutralization and results in the formation of water and a salt.

Explanation:Hope this helps :)

5 0

3 years ago

How many total atoms are there in 69.1 g of ammonia (NH3)?

lozanna [386]

Answer:

answers is - 3.568

I think this correct answer

5 0

3 years ago

Complete this reaction of a carboxylic acid with a strong base.

raketka [301]

Answer:

C6H5COOH + OH- —> C6H5COO- + H2O

Explanation:

C6H5COOH + OH- —> C6H5COO- + H2O

In the reaction above, C6H5COOH donate a proton(H+) to form the carboxylate ion C6H5COO-. The proton (H+) combines with the OH- to form H2O.

This can better be understood in the illustration below

C6H5COOH + NaOH —> C6H5COONa + H2O

6 0

3 years ago