The formula that we will be using is:
total salt / total solution = .10
Let a be the ml of the first solution
And let b be the ml of the second solution
.25a + .05b / a + b = .10
Also:
a + b = 1400
a = 1400 - b
So substitute:
.25 x (1400 - b) + .05b / 1400 = .10
350 - .25b + 0.05b/ 1400 = .10
350 - .2b / 1400 = .10
350 - .2b = .10 x 1400
.2b = 350 - 140
.2b = 210
b = 1050
a = 1400 - b
a = 1400 - 1050
= 350 mL
Answer:
(A) 0.4M NaOH
Explanation:
The 20M NaOH caustic soda is diluted from 10mL to 500mL, that is:
500mL / 10mL = Is diluted 50 times.
That means we can solve the new concentration of the diluted solution dividing the stock concentration (20M) 50 times:
20M / 50 = 0.4M NaOH is the concentration of the diluted NaOH solution.
Right answer is:
<h3>(A) 0.4M NaOH</h3>
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because of the absence of options. However, it seeks to differentiate between a scalar and a vector quantity. A scalar quantity is a quantity with just magnitude but no direction (example is mass) while a vector quantity is a quantity with both magnitude and direction. Thus, a quantity needs direction to complete it's description when such quantities is a vector quantity such as weight (which is the <u>downward force/gravity</u> acting on an object with <u>relative mass</u>). The mass is the magnitude while the gravity/downward force is the direction. It would just be a scalar quantity if it had just mass and no downward force (as in direction) acting on it.
<span>B. Box A is a compound and Box B is an element.</span>
