Answered

Discover a world of knowledge at Westonci.ca, where experts and enthusiasts come together to answer your questions. Get expert answers to your questions quickly and accurately from our dedicated community of professionals. Get detailed and accurate answers to your questions from a dedicated community of experts on our Q&A platform.

how much water should be added to 10 mL of 7% alcohol solution to reduce the concentration to 5%?

Sagot :

naǫ
The volumes of the substances:
[tex]V_{water}=10 \ mL \\ V_{alcohol}= 10 \ mL \times 7\%=10 \ mL \times 0.07=0.7 \ mL[/tex]

x - the amount of water that should be added

[tex]\frac{0.7}{10+x}=5\% \\ \frac{0.7}{10+x}=0.05 \ \ \ \ \ \ \ \ \ \ \ |\times (10+x) \\ 0.7=0.05(10+x) \\ 0.7=0.5+0.05x \ \ \ \ |-0.5 \\ 0.2=0.05x \ \ \ \ \ \ \ \ \ \ \ |\times 20 \\ x=4[/tex]

4 mL of water should be added.
Thanks for stopping by. We strive to provide the best answers for all your questions. See you again soon. We hope you found this helpful. Feel free to come back anytime for more accurate answers and updated information. We're glad you chose Westonci.ca. Revisit us for updated answers from our knowledgeable team.