An unknown salt is either NaF, NaCl, or NaOCl. When 0.050 mol of the salt is dissolved in water to form 0.500 L of solution, the pH of the solution is 8.08. Part A What is the identity of the salt?

The unknown salt is NaF

Explanation:

To calculate the molarity of solution, we use the equation:

Moles of salt = 0.050 moles

Volume of solution = 0.500 L

Putting values in above equation, we get:

pH + pOH = 14

We are given:

pH = 8.08

Putting values in above equation, we get:

The unknown salt given are formed by the combination of weak acid and strong acid which is NaOH

The chemical equation for the hydrolysis of ions follows:

Initial:              0.1

At eqllm:        0.1-x                           x              x

Concentration of

The expression of for above equation follows:

Putting values in above expression, we get:

where,

= Ionic product of water =

= Acid dissociation constant

= Base dissociation constant =

Putting values in above equation, we get:

We know that:

So, the calculated is approximately equal to the of HF

Hence, the unknown salt is NaF

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.