Solve the Problem $\mathrm { pH }$ Scale to Represent the Level of Acidity or Alkalinity of Scale

question 234

Multiple Choice

Solve the problem.
-Scientists use the $\mathrm { pH }$ scale to represent the level of acidity or alkalinity of a liquid. This is based on the molar concentration of hydronium ions, $\left[ \mathrm { H } ^ { + } \right]$ . Since the values of $\left[ \mathrm { H } ^ { + } \right]$ vary over a large range, $1 \times 10 ^ { 0 }$ mole per liter to $1 \times 10 ^ { - 14 }$ mole per liter $( \mathrm { mol } / \mathrm { L } )$ , a logarithmic scale is used to compute the $\mathrm { pH }$ . The formula $\mathrm { pH } = - \log \left[ \mathrm { H } ^ { + } \right]$ represents the $\mathrm { pH }$ of a liquid as a function of its concentration of hydronium ions, $\left[ \mathrm { H } ^ { + } \right]$ . The pH scale ranges from 0 to 14 . Pure water is taken as neutral having a $\mathrm { pH }$ of 7 . A pH less than 7 is acidic. A pH greater than 7 is alkaline (or basic) .

Two acids have $\left[ \mathrm { H } ^ { + } \right]$ values of $3.2 \times 10 ^ { - 3 } \mathrm {~mol} / \mathrm { L }$ and $2.4 \times 10 ^ { - 6 } \mathrm {~mol} / \mathrm { L }$ respectively. Find the $\mathrm { pH }$ for each acid. Which substance is more acidic? Round $\mathrm { pH }$ values to 1 decimal place.

• A) \(2.5 ; 5.6\); The first acid is more acidic.
• B) \(5.7 ; 12.9\); The second acid is more acidic
• C) \(2.5 ; 5.6\); The second acid is more acidic.
• D) \(5.7 ; 12.9\); The first acid is more acidic.

---

Definitions:

Burden

The negative impact or strain experienced by individuals or groups due to economic policies, environmental factors, or other societal conditions.

Excise Tax

A tax levied on certain goods and commodities produced or sold within a country and on licenses granted for certain activities.

Consumers

Consumers are individuals or organizations that use economic goods or services, driving demand in the economy through their purchasing choices and preferences.

Producers

Producers are individuals or entities that create goods or provide services.