Indicate what aqueous solution is basic at 25° C. Unanswered...

Indicate what aqueous solution is basic at 25° C. Unanswered • 104 seconds left (This question text is only available on the projector or screen in the classroom.) A [H+] = 4 \times 10^{-9} M B [OH-] = 1 \times 10^{-7} M C [OH-] = 7 \times 10^{-13} M

Transcript

00:01 Hi, so we're calculating the hydrogen ion concentration or the hydroxide ion concentration based on the given information here.

00:15 Okay, so these are the formula that we're going to use.

00:18 Remember, ph, this is equivalent to negative log of hydrogen ion concentration or hydrogen ion.

00:28 And then poh is equivalent to negative log of the hydroxide ion concentration.

00:36 And then the sum of the ph and poh of a solution will always be equivalent to 14.

00:44 And how do we solve for the hydronium and hydroxide ion concentration if we know the ph and powh? so the formula is that hydronium ion concentration is equivalent to sand to the negative ph.

00:58 It's just the opposite.

01:00 And then the hydroxide ion concentration is equivalent to sand to the negative poh.

01:06 Okay, so these are the formulas that we're going to use to solve for the unknown here.

01:13 The first one we're given with the hydroxide -oh -h concentration, so that means we need to solve for the hydronium ion concentration.

01:23 Okay, so let's solve for poh first, negative log of 1 .501 times 10 to the negative 7.

01:33 This will be 6 .8 .2.

01:39 So the hydrogenium ion concentration is therefore equivalent to 10 to the negative.

01:46 What's the ph for this? let's subtract 14 minus poh 6 .802 and we'll get 6 .61 times 10 to the negative 8 molar.

02:01 Okay, that's the unit because this is concentration.

02:06 Okay, that's the answer for the first solution.

02:10 Next one, we're given with the hydrogen concentration.

02:15 So we'll solve for oh minus concentration.

02:18 Sol for ph first, negative log of 9 .61 times 10 to the negative 9.

02:25 This will be equivalent to 8 .02...

Question

Indicate what aqueous solution is basic at 25° C. Unanswered • 104 seconds left (This question text is only available on the projector or screen in the classroom.) A [H+] = 4 \times 10^{-9} M B [OH-] = 1 \times 10^{-7} M C [OH-] = 7 \times 10^{-13} M

Please give Ace some feedback