Interview
Grade 11 Chemistry Concentration Problems/Solutions
Grade 11 Chemistry Concentration Problems/Solutions
[Show more]
Seller
Follow
Content preview
Concentration Problems1. What mass of NaCl is needed to produce a 500 g of a 6.40% M/M solution?
% M/M = ( M[solute] ÷ M[solution] ) x 100
M[NaCl] = ( 6.4 x 500 ) ÷ 100
= 32 g
∴ 32 g of NaCl is needed.
2. What is the concentration, in g/100 mL, of a solution made by dissolving 123.2 g
of phosphoric acid in 50.0 mL of solution?
C = quantity ÷ volume
= 123.2 g ÷ 50 mL
= 2.464 g/mL
100 𝑚𝐿
2.264 g/ml x = 246.4 g/100mL
100 𝑚𝐿
∴ 246.4 g/100mL is the concentration.
3. How much water is needed to produce a 0.68 M solution of copper (I) carbonate,
if 3.58 g is used?
, MM [Cu₂CO₃] = ( 63.546 x 2) + 12.011 + ( 15.999 x 3 ) = 187.1 g/mol
Moles to grams:
3.58 g ÷ 187.1 g/mol = 0.019 mol Cu₂CO₃
Molarity = moles ÷ L
L = 0.019 mol ÷ 0.68 M
= 0.028 L
∴ 0.028 L or 28 mL water is needed.
4. What mass of carbon dioxide would you add to 1 500 L of water in order to make
a 325 ppm solution?
C = ( quantity ÷ volume ) x 10⁶ ppm
Quantity = ( 325 ppm x 1500000 g ) ÷ 10⁶
= 487.5 g
∴ 487.5 g of carbon dioxide is needed.
5. What is the concentration of a solution made by diluting 14.0 mL of a 4.20 M
Na₂CO₃ to 86.0 mL?
CᵢVᵢ = CfVf
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller timeforminecraft2002. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$4.43. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
68443 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 15 years now