Which of the following conditions indicate a basic solution at 25°c?

a. poh=11.21
b. ph=9.42
c. [oh-]> [h+]
d. [oh]> 1.0 x 10^-7 m

B. , C.  and D.

Explanation:

pH is defined as the negative logarithm of the concentration of hydrogen ions.

Thus,  

pH = - log [H⁺]

pH scale generally runs from 1 to 14 where pH = 7 represents neutral medium, pH < 7 represents acidic medium and pH > 7 represents basic medium.

Also, pH + pOH = 14  

(a) So, pOH = 11.21

pH = 14 - 11.21 = 2.79

The solution is acidic.

(b) pH = 9.42

The solution is basic.

c. [OH⁻] > [H⁺]

More concentration of hydroxide ions leads to basic solution.

d. [OH⁻]> 1.0 x 10⁻⁷ M

1.0 x 10⁻⁷ M leads to neutral solution and hydroxide ions concentration greater than this yields to basic solution.

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i