Question

A student takes a measured volume of 3.00 M HCl to prepare a 50.0 mL sample of 1.80 M HCl. What volume of 3.00 M HCl did the student use to make the sample? Use M subscript i V subscript i equals M subscript f V subscript f.. 3.70 mL 16.7 mL 30.0 mL 83.3 mL

Answer 1

83.3 mL

Explanation:

M$_{i}$ = 3M

V$_{i}$ = 50mL

M$_{f}$ = 1.80M

Unknown:

V$_{f}$ = ?

Solution:

To solve this problem we must understand that the initial and final number of moles remains the same.

  Number of moles = molarity x volume

Molarity x volume of initial solution = Molarity x volume of final solution

 Therefore:

   M$_{i}$  x  V$_{i}$     = M$_{f}$ x   V$_{f}$

M is the molarity

V is the volume

i = initial state

f = final state

    input the parameters;

  3 x 50 = 1.8 x V$_{f}$

      V$_{f}$ = 83.3 mL

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Answer 2

Answer:

83.3

Explanation:

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