Q. 10.35 - An Introduction to General, Organic, and Biological Chemistry

Question

State whether each of the following is acidic, basic, or neutral:

a. blood plasma. pH $1 7.38$

b. vinegar, $\mathrm{pH} 2.8$

c. drain cleaner $pH 11.2$

d. coffee, $pH 5.52$

e. tomatoes, $pH 4.2$

f. chocolate cake, $pH 7.6$

Step-by-Step Solution

Answer

(Part a) The blood plasma is basic nature

(Part b) The vinegar is acidic in nature

(Part c) The drain cleaner is basic nature

(Part d) The coffee is acidic in nature

(Part  e) The tomatoes are acidic in nature

(Part f) The chocolate cake is basic in nature

Step 1: Introduction (part a )

The given is various components with pH values

The objective is to determine whether the component is acidic, basic, or neutral

Step 2: Explanation (part a)

On the pH scale, values below $7.0$ are acidic, a value of $7.0$ is neutral, and values above $7.0$ are basic.

Acidic solution $=\mathrm{pH}<7.0\left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right]>1.0\times {10}^{-7}\mathrm{M}$

Neutral solution $=\mathrm{pH}=7.0\left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right]=1.0\times {10}^{-7}\mathrm{M}$

Basic solution $=\mathrm{pH}>7.0\left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right]<1.0\times {10}^{-7}\mathrm{M}$

a) The pH of blood plasma is $7.38$ A pH value greater than $7$ indicates a basic solution on the pH scale.

Step 3: Introduction (part b)

The objective is to determine whether the component is acidic, basic, or neutral

Step 4: Explanation (part b)

The $pH$ of vinegar is $2.8$. A $pH$ value less than $7$ indicates an acidic solution on the $pH$ scale.

Step 5: Introduction (part c)

The objective is to determine whether the component is acidic, basic, or neutral

Step 6: Explanation (part c)

The $pH$ of drain cleaning is $11.2$. A $pH$ value greater than $7$ is considered a basic solution on the $pH$ scale.

Step 7: Introduction (part d)

The objective is to determine whether the component is acidic, basic, or neutral

Step 8: Explanation (part d)

The $pH$ of coffee is $5.52$. A $pH$ value less than $7$ indicates an acidic solution on the $pH$ scale.

Step 9: Introduction (part e)

The objective is to determine whether the component is acidic, basic, or neutral 

Step 10: Explanation (part e)

$pH = 4.2$tomatoes A $pH$ value less than $7$ indicates an acidic solution on the $pH$ scale.

Step 11: Introduction (part f)

The objective is to determine whether the component is acidic, basic, or neutral 

Step 12: Explanation (part f)

$pH=7.6$ chocolate cake The $pH$ value greater than $7$ is a basic solution on the $pH$ scale.