[5] A solution has a hydronium-ion concentration of 1.0 x 10-5 mol per liter. Wh

Question

[5] A solution has a hydronium-ion concentration of 1.0 x 10-5 mol per liter. What is the pH of this solution? Is this solution acidic or basic? What is the hydroxide-ion concentration of this solution?

[6] Balance the following chemical equations.
a. Ni + O2 ? Ni2O3
b. F2 + HBr ? Br2 + HF


7. You walk into a cave and shout out your name and you receive an echo 0.3 seconds later. How far are you from the cave wall?


8. What would be the temperature when 50 g of 40 0C water is mixed with 30 g of 60 0C water?

Explanation / Answer

5) pH = - log10([H+]) = 5 (here)

also pH< 7 acidic. so the solution is acidic

6) speed of sound =340.29 m/s

So distance of wall = 340.29*0.3 / 2 = 51 m

7) Final temp be T

then 50 ( T-40 ) = 30 (60-T)

80T = 3800

T = 47.5 oC

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