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Acid-Base

Titrations of acids and bases, how do weak acids react with eachother?

what are the products for this equation HCN+HF=?

I would assume that it is NH2+CF, but due to electronegativity HF holds on to its proton, so I am unsure what the products would be, thanks for any help!

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Calculate the pH in a mixture of 10 ml 0.1 benzoic acid and 11 ml 0.1 M Naoh.

Calculate pH in in a mixture of 10ml 0.1M benzoic acid and 11 ml 0.1M Naoh.

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An acid-base buffer problem having to do with titration

what volume of 0.010M NaOH must be added to a 100mL solution that is a mixture of 0.010M NaHCO3 and 0.010M Na2CO3, in order to completely eliminate its buffering properties?

I just started my first year in college and I honestly do not remember enough chemistry to do even start this problem.

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scored 31 times for the Catrachos

 Most forecasters have Honduras in the bottom of the fifth set, and with good reason.FIFA 15 hours: June 15 15:00, Porto Alegre France versus Honduras20 June 13:00, Curitiba Honduras vs. Ecuador25 16 Jun: 00, Manaus Honduras vs. player SwitzerlandStar : Carlo CostlyWith plans to play with two defensive midfielders, and put Luis Fernando Suarez 4 4 2 lot of confidence in the forward Carlo Costly and Jerry Bengtson, but with very little Bengtson. It may be a good time to carry this burden. Dure from the scoring with his club New England Revolution MLS with three goals in four football 15 for Real Spain before leaving the camp FIFA coins of the national ultimate team after years of 31 in the country, scored 31 times for the Catrachos, and the only time Houston Dynamo is the best bet for the front of your ultimate team to do what he does not can do anything in 2010: Brands goal.Manager: Luis Fernando SuárezThe man who led Ecuador to better her performance in the World Cup 2006 has been hired to do with Honduras, which led him to the same 96 players look like since he was hired in 2011, and finally, regulates Suarez in compatriot similar Reinaldo Reuda approaching the coach who led the ultimate team held the backbone of the ultimate team after the 2010 goalkeeper World Cup Noel Valladares, defender Maynor Figueroa and midfielder Wilson Palacious instead hope Suarez is the backbone of South Africa will produces better results in Brazil.

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Balance eqn and write net ionic eqn

I can't for the life of me figure these problems out.  Question seems simple and straight forward but I run in to all kinds of problems when trying to solve.  

Question: Complete and balance the following molecular equations and then write the net ionic equation for each:

a) HBr(aq) + Ca(OH)2(aq) --->

b) Cu(OH)2(s) + HClO4(aq)---->

c) Al(OH)3(s) + HNO3(aq)------>

I looked at the answer key and it showed the answer for a) to be:

2HBr(aq) + Ca(OH)2(aq) ---> CaBr(aq) + 2H2O(l) Net ionic: H+(aq) + OH-(aq) ---> H2O(l).  Which doesnt even begin to make sense as the molecular equation is not even balanced and it yields CaBr ( how does that even happen Ca2+ and Br-?)

I'd greatly appreciate if someone could guide me in the right direction.  Too mind boggled at the moment to even continue.    

 

Via: (page 172 Pearson Custom Library Chemistry 101 text)

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Find the wt% KHP in an unknown via titration?

So in lab we had to find the wt% of KHP in an unknown (with another soluble salt). The wt% varies between 15-80%.

We used 0.1 M NaOH. 

I had 10.0216 g of unknown disolved in 250 mL of H2O. 

40 mL of the KHP solution took 29.90 mL NaOH and 29.85 mL NaOH to neutralize.

To find the wt%, this is my work

0.02990 L NaOH x 0.10mol/L NaOH = 0.002990 moles (of NaOH and KHP)

0.002990moles / 0.040 L = 0.07475m/L of KHP

0.07475moles x 204.218 g/mole = 15.265 g KHP / L

but because this was in 40 mL, I took 15.265 g x 0.04 = 0.610612 g/40 mL

and since it stared with 250 mL, I multiplied 0.6106 x (250/40) and got 3.81625 grams

3.816/10.0216 g  x  100 = 38.063 wt%

(and did the same for 29.85)

 

I'm just not sure if this is the correct way to do this. No one else that I've talked to has done it this way.

Any help would be appreciated!

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calculate the moles concept of the questions

1) 1 mole of sulphuric acid react with 1 mole of sodium carbonate to form salt, water and carbon dioxide.

write an equation?

 

ii) calculate the mass of the salt formedd when 10.6g of sodium carbonate are used in the reaction?

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Which of the following procedures would produce an effective pH=4.75 buffer? Briefly explain why or why not for each.

(a) Mix 50.0 mL of 0.10 M acetic acid with 50.0 mL of 0.10 M sodium acetate. 

(b) Mix 50.0 mL of 0.20 M acetic acid with 50.0 mL of 0.10 M sodium hydroxide.

(c) Start with 50.0 mL of 0.20 M acetic acid and slowly add sodium hydroxide until the pH reaches 4.75.

(d) Start with 50.0 mL of 0.20 M hydrchloric acid and slowly add sodium hydroxide solution until the pH reaches 4.75.

(e) Start with 50.0 mL of 0.20 M sodium acetate and slowly add hydrochloric acid solution until the pH reaches 4.75.

(f) Mix 50 mL of 0.10 mM acetic acid with 50.0 mL of 0.10 mM sodium acetate. 

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Help with Identifying a Redox Reaction?

Okay, so the equation is as follows:

2KOH + K2Cr2O7 --> 2K2CrO4 + H2O

And my question is: 

Identify the oxidation numbers for each element in the equation. Then determine whether the equation describes a redox reaction. Justify your answer in terms of electron transfer. Describe the oxidation and reduction that occurs. 

I can figure out the oxidation numbers just fine. This is just confusing because I'm not sure if this is an acidic or basic solution, and I'm not sure how to describe the electron transfer in this equation. SOS!

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Determine a certain mass when given pH

I need to create a 1 L. solution at 5.16 pH from ammoniumbromide at 25 degress celcius.

Ka NH4+ = 5.4 x 10-10.

Can you help? :/

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