Answer to Question #139181 in General Chemistry for Simran

Question

How many moles of hydroxide ions are there in 25.00 mL of a 0.2994 M aqueous solution of the strong base calcium hydroxide?

Answer 1

If in 1000 ml solution 1 mole is present then it will be 1M solution

Similarly if 0.025 mole is present in 25 ml solution then it will be 1M solution

Now to make 25 ml of 0.2994M solution (0.025×0.2994)= 0.007485 mole of Ca(OH)2 is required

In 1 mole of Ca(OH)2 ,2 moles of hydroxide ion present

So in 0.007485 mole of Ca(OH)2

= 0.007485×2

=0.01497 moles of hydroxide is present