Gtemp Posted September 18, 2017 Report Share Posted September 18, 2017 (edited) So I recently came across a question that I just can't figure out (it might be really simple but I seriously need help with this one). So here it is: What is the concentration of OH– ions (in mol dm–3) in an aqueous solution in which [H+] = 2.0×10^–3 mol dm–3? (Kw = 1.0×10^–14 mol2 dm–6) A. 2.0×10^–3 B. 4.0×10^–6 C. 5.0×10^–12 D. 2.0×10^–17 If you could just work through the steps to give you the answer (which by the way is C according to the markscheme) that would be great. Please help, it's killing me... Edited September 18, 2017 by Gtemp Reply Link to post Share on other sites More sharing options...
kw0573 Posted September 18, 2017 Report Share Posted September 18, 2017 Kw =[H+][OH-]. Then to solve for [OH-] it's just division. Reply Link to post Share on other sites More sharing options...
Msj Chem Posted September 19, 2017 Report Share Posted September 19, 2017 On 2017-9-19 at 2:44 AM, Gtemp said: So I recently came across a question that I just can't figure out (it might be really simple but I seriously need help with this one). So here it is: What is the concentration of OH– ions (in mol dm–3) in an aqueous solution in which [H+] = 2.0×10^–3 mol dm–3? (Kw = 1.0×10^–14 mol2 dm–6) A. 2.0×10^–3 B. 4.0×10^–6 C. 5.0×10^–12 D. 2.0×10^–17 If you could just work through the steps to give you the answer (which by the way is C according to the markscheme) that would be great. Please help, it's killing me... Maybe these videos will help: Reply Link to post Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.