shansaidkhalid
Answered

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A beaker contains 1.0 M NaOH(aq) solution. To produce a NaOH(aq) solution of molar concentration 0.20 M, we transfer 2.0 ml (cm^3) out of this beaker into a 25 ml cylinder and add distilled water until the total volume reading becomes
A) 12ml
B)10ml
C)8ml
D)5ml
E)2ml

Sagot :

Answer: B) 10 ml

Explanation:

According to the dilution law,

[tex]M_1V_1=M_2V_2[/tex]

where,  

[tex]M_1[/tex] = molarity of  stock [tex]NaOH[/tex] solution = 1.0 M

[tex]V_1[/tex] = volume of stock [tex]NaOH[/tex] solution = 2.0 ml  

[tex]M_1[/tex] = molarity of dilute [tex]NaOH[/tex]  solution = 0.20 M

[tex]V_1[/tex] = volume of diluted [tex]NaOH[/tex] solution = ?

Putting in the values we get:

[tex]1.0\times 2.0=0.20\times V_2[/tex]

[tex]V_2=10ml[/tex]

Therefore, final volume reading is 10 ml

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