Help with 2 chemistry questions please :(

Watch
Ali123432221
Badges: 2
Rep:
?
#1
Report Thread starter 2 years ago
#1
Need help with these as I have no idea at all

Q1) what mass of solid Zinc nitrate --Zn(No3)2-- is required to make 250mL of a 0.1mol/L aqueous solution.

Q2) What volume of water must be added to 50mL of 1mol/L hydrochloric acid to produce a solution with a concentration of 0.050 mol/L?
0
reply
jeoja
Badges: 9
Rep:
?
#2
Report 2 years ago
#2
Hi. I'll start by giving some formulae/concepts you need to solve the questions to see if you can work it out from there. If not then I'll give further help

Q1) 250ml = 0.25l (I know this is a bit obvious but could be easy to forget to convert)
mol = concentration * volume
mass = mol * Mr

From the above information you can figure out how many moles you need of the zinc nitrate to get that concentration for the stated volume, and therefore the mass.

Q2) 50ml = 0.05l
mol = concentration * volume

For this one I could be wrong but I think it ends up being simpler than it sounds. Once you find the moles of HCl you have in 0.05L you only need to do a quick subtraction to find the answer if you think about what all of the units mean. I appreciate this help is a bit vague but if you can figure it out for yourself I don't want to give too much away and take away any satisfaction!
1
reply
Ali123432221
Badges: 2
Rep:
?
#3
Report Thread starter 2 years ago
#3
Thanks man, yeah I should be able to figure it out 😊
0
reply
jeoja
Badges: 9
Rep:
?
#4
Report 2 years ago
#4
(Original post by Ali123432221)
Thanks man, yeah I should be able to figure it out 😊
No problem! Have a good day.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Feeling behind at school/college? What is the best thing your teachers could to help you catch up?

Extra compulsory independent learning activities (eg, homework tasks) (1)
4.55%
Run extra compulsory lessons or workshops (4)
18.18%
Focus on making the normal lesson time with them as high quality as possible (3)
13.64%
Focus on making the normal learning resources as high quality/accessible as possible (2)
9.09%
Provide extra optional activities, lessons and/or workshops (9)
40.91%
Assess students, decide who needs extra support and focus on these students (3)
13.64%

Watched Threads

View All