Answer: 248mL
Step-by-step explanation:
Given:
Concentration of buffer solution Cs = 1.24%w/v of boric acid
Concentration of boric acid solution Cb = 5 % w/v boric acid
For 1 liter of buffer solution, the weight of boric acid needed is:
mb = 1 × 1.24 = 1.24 unit weight
mb = Cb × Vb .....1
Cb = concentration of boric acid solution.
Vb = volume of boric acid solution needed.
mb = weight of boric acid needed.
From equation 1.
Vb = mb/Cb
Vb = 1.24/5
Vb = 0.248L
Vb = 248mL
Answer:
b)
{t | –3 < t ≤ 5}
Step-by-step explanation:
–4 < 3t + 5 ≤ 20
⇔
-4 - 5 < 3t ≤ 15
⇔
-9 < 3t ≤ 15
⇔
-3 < t ≤ 5
1/3 and 2/3 is the answer I think I’m not 100% sure
Answer:
The thing you should notice is that when we multiply a number by 10^n
(where n is the number of zeros that the number has) we move the decimal point on the first number n times to the right.
For example, if we have the number:
7.231 and we multiply it by 100 (there are 2 zeros) then the decimal point is moved two times to the right:
7.231*100 = 723.1
This happens because the base of our math is 10 (the decimal system).
