16.3 The pH Scale and pH Calculations | General Chemistry
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- Опубліковано 5 сер 2024
- Chad provides chemistry lesson on the pH Scale for acids and bases and pH Calculations. First, the pH scale is introduced with a pH less than 7 corresponding to an acidic solution, a pH above 7 a basic solution, and a pH equal to 7 a neutral solution. The logarithmic nature of the pH scale is also described as each pH unit difference corresponds to a 10-fold difference in the H+ and OH- concentrations. The pH formula and pOH formula are then defined (pH = -log [H+]; pOH = -log[OH-]) and several examples of how to calculate of pH, pOH, [H+], and [OH-] are performed. Their relationships are demonstrated with several example calculations, and it is made evident how when provided any 1 of the 4 values, the other 3 can be calculated.
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00:00 Lesson Introduction
00:26 Autoionization of Water. Kw, and the pH Scale
04:48 pH Formula and pOH Formula
08:23 The pH Scale
13:41 How to Calculate pH, pOH, [H+], [OH-]
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Having second semester Gen Chem Exams in a couple of days. Just want you to know that I survived the first semester because of you!
Glad you survived - I hope you THRIVE - Happy Studying!
You are an amazing teacher. Thank you for all the help and making things so simple to understand. You are a gem!
You're welcome and Thank You!
Bro, I laughed so hard at the mom joke. Wasn't expecting that. Lmao
Glad to hear it!
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Glad it was helpful, Chloe - thanks!
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You're welcome.
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Great video! Very helpful!
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Glad it was helpful!
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Happy Studying!
super helpful, thanks sir!
Glad you found it helpful!
I've been watching a lot of your videos lately, thank you. I'm looking for a video that will explain how to calculate the theoretical pH-value for solutions. For example, how to calculate the theoretical pH for a 2.5 mmol/L H2PO4- solution and a 5.0 mmol/L NH4+ solution. There are apparently different formulas based on strong, middle or weak acids, and for strong, middle or weak bases. I'm learning it in a language other than English (Danish), which adds to my confusion since I'm not a native Danish speaker. I'm looking for a good explanation in English. Do you have a video that teaches this? Thanks in advance.
Thanks.
Can you prepare a class on pH calculations from alkalinity equilibrium? CO2, Bicarbonates, and carbonates?
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So, at 37C the pH of water is 6.5. Does it mean it is more acidic? Please elaborate.
7 maybe 7.2.. maybe
Calculate yourself. Use Kw for 37C.
I have a question for you. How can we have OH and H in a solution forever and never have a reaction between them?
I say forever because you can have steady ph forever in a solution.
I would imagine if you put OH- and H+ in a solution it would react quite quickly and neutralize each other to a point where you only have H+ or OH-.
And that’s when H,H2CO2, HCO3,CO3,OH concentrations becomes important for PH calculation.
Is there a statement in the video that is confusing you here? If so let me know the time. OH- and H+ are in a dynamic equilibrium so there is a constant interaction back and forth between the ions, some react and neutralize and some remain dissociated
Never noticed anyone menton this in previous videos, but the shirt is amazing!💪🙏
Thank you. Happy Studying!
Sir, Are you membership acs and iupac?
Neither. How about you? Your name implies a fondness for chemistry.
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Nice video sir,
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6:40 😂
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