A scientist has a beaker containing 20 mL of a solution containing 20% acid. To

Question

A scientist has a beaker containing 20 mL of a solution containing 20% acid. To dilute this, she adds pure water.
a. Write an equation for the concentration in the beaker after adding n mL of water.
b. Find the concentration if 10 mL of water has been added.
c. How many mL of water must be added to obtain a 4% solution?
d. What is the behavior as n , and what is the physical significance of this?
MAKE SURE TO ANSWER THE WHOLE QUESTION,PLEASE!!! if nottt dont answer just one part. Thanks A scientist has a beaker containing 20 mL of a solution containing 20% acid. To dilute this, she adds pure water.
a. Write an equation for the concentration in the beaker after adding n mL of water.
b. Find the concentration if 10 mL of water has been added.
c. How many mL of water must be added to obtain a 4% solution?
d. What is the behavior as n , and what is the physical significance of this?
MAKE SURE TO ANSWER THE WHOLE QUESTION,PLEASE!!! if nottt dont answer just one part. Thanks A scientist has a beaker containing 20 mL of a solution containing 20% acid. To dilute this, she adds pure water.
a. Write an equation for the concentration in the beaker after adding n mL of water.
b. Find the concentration if 10 mL of water has been added.
c. How many mL of water must be added to obtain a 4% solution?
d. What is the behavior as n , and what is the physical significance of this?
MAKE SURE TO ANSWER THE WHOLE QUESTION,PLEASE!!! if nottt dont answer just one part. Thanks A scientist has a beaker containing 20 mL of a solution containing 20% acid. To dilute this, she adds pure water.
a. Write an equation for the concentration in the beaker after adding n mL of water.
b. Find the concentration if 10 mL of water has been added.
c. How many mL of water must be added to obtain a 4% solution?
d. What is the behavior as n , and what is the physical significance of this?
MAKE SURE TO ANSWER THE WHOLE QUESTION,PLEASE!!! if nottt dont answer just one part. Thanks A scientist has a beaker containing 20 mL of a solution containing 20% acid. To dilute this, she adds pure water.
a. Write an equation for the concentration in the beaker after adding n mL of water.
b. Find the concentration if 10 mL of water has been added.
c. How many mL of water must be added to obtain a 4% solution?
d. What is the behavior as n , and what is the physical significance of this?
MAKE SURE TO ANSWER THE WHOLE QUESTION,PLEASE!!! if nottt dont answer just one part. Thanks

Explanation / Answer

(a) we know that acid + acid = acid

So, 0.20*20 + 0*n = x(20+n)

=>4=20x+nx

(b)n=10

=>4=20x+nx=20x+10x=30x

=> x=4/30=0.133

so concentration is 13.3%

(c)x=4%=0.04

=>4=20x+nx

=> 4=20*0.04+0.04n=0.8+0.04n

=>3.2=0.04n

=>n=3.2/0.04=80 ml

(d) as n , as more water added concentration tends to 0

=> x 0

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