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polet [3.4K]
3 years ago
8

Please help me ASAP !!!!

Chemistry
1 answer:
Zarrin [17]3 years ago
6 0

Answer:

Volume of HBr = V₂ =  7.5 mL

Explanation:

Given data:

Volume of NaOH =V₁= 25.0 mL

Molarity of NaOH =M₁= 0.150 M

Molarity of HBr =M₂= 0.5 M

Volume of HBr =V₂= ?

Solution:

M₁V₁    =      M₂V₂

0.150 M ×25.0 mL = 0.5 M×V₂

V₂ = 0.150 M ×25.0 mL  / 0.5 M

V₂ = 3.75 M.mL /0.5 M

V₂ =  7.5 mL

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Stoichiometry time! Remember to look at the equation for your molar ratios in other problems.

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There's also a shorter way to do this: Notice the molar ratio from Cu to Ag, which is 1:2. When you plug in 31.75 into your molar mass for Cu, it equals 1/2 mol. That also means that you have 1 mol Ag because of the ratio, qhich you can then plug into your molar mass, getting 107.9 as well.
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