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What is the molarity of a NaCl solution that becomes 0.15 M NaCl when 2.0 L is diluted to 6.5 L?

Sagot :

All problems where they prepare a solution with another solution are solved basically the same. we just have to remember the following equation:

[tex]C_1\times V_1=C_2\times V_2[/tex]

The problem gives V1=2L, V2=6.5L and C2=0.15M and ask for C1. Then we just have to solve for C1

[tex]C_1=\frac{C_2V_2}{V_1}=\frac{0.15M\times6.5L}{2L}=0.48M[/tex]

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