35 Answered Questions for the topic Acid Base

Acid Base Chemistry Titration

04/15/22

#### titration - chemistry

To titrate 1.18 g of a dicarboxylic acid COOH-(CH2)n-COOH to the second equivalence point, 25 ml of a 0.80mol/L NaOH solution is needed. What is the value of n?answer is 2
Acid Base Chemistry Buffer

04/15/22

#### Buffer solution - chemistry (5)

Assume that 20 mL of a 0.10 molar HCl solution is added to 200 mL of a buffer mixture of Na2HPO4 and NAH2PO4 (in which both buffer components have a concentration of 0.050 molar). Which of the... more
Acid Base Chemistry Ph

04/13/22

#### chemistry - pH color change range indicator (9.21)

The color change range of the indicator methyl orange is between pH 3.2 and 4.4 and that of phenolphthalein between pH 8.2 and 10.0. In which of the following titrations can only methyl orange be... more

04/13/22

#### chemistry - strong acid

Which of the following statements about the strength of acids is correct? A. Any cation BH+ derived from a weak base B, is a strong acid. B. Any acid that dissolves well in water is a strong acid.... more
Acid Base Chemistry Molar Mass

04/13/22

#### molar mass - acid base problem -chemistry (9.11)

100ml of a solution containing 0.081 g of a strong acid HA has a pH=2. What is the chemical formula of the strong acid?A. HFB. HClC. HBr (the answer)D. HIso I came up... more

07/16/19

#### Why is acetic acid more acidic than phenol?

Acetic acid (ethanoic acid, $\\mathrm pK_\\mathrm a \\approx 5$) is more acidic than phenol ($\\mathrm pK_\\mathrm a \\approx 10$), which is reflected in their reactivity with a weak base such as... more

07/11/19

#### Why is the iodide anion a good nucleophile but a poor base?

The $\\mathrm{pK_{aH}}$ of $\\ce I^-$ is very low which indicated that it is not favourable for it to bond with a proton. However, why would it be likely to bond with any other atom (mostly carbon... more

#### Why concentrated sulfuric acid for dehydration and dilute for hydration?

To dehydrate ethanol one uses concentrated sulfuric acid: $$\\ce{C2H5OH ->[\ ext{conc.} H2SO4] C2H4 + H2O}$$ but to go in the reverse direction, dilute sulfuric acid is used: \\ce{C2H4 +... more

07/05/19

#### Does unsubstituted benzoic acid not show resonance due to steric effects?

My book says that benzoic acid does not show resonance as the carboxylate anion and the benzene ring are not in the same plane due to steric effects. But there aren't any large groups in the... more

06/24/19

#### Difference between Sildenafil and Sildenafil citrate?

The data I found seems to show no difference between Sildenafil and Sildenafil citrate. But if they are the same things, why Pfizer use Sildenafil citrate instead of Sildenafil as their product... more
Acid Base Organic Chemistry

04/21/19

#### Condition For NaHCO3 to react to form CO2 with organic acids?

My professor told us the following: NaHCO3 will react to evolveCO2 whenever the acidic nature of the reactant exceeds the acidic nature of benzoic acid. I want to know why this is. And is the... more

03/15/19

#### Why are acetals stable to bases and nucleophiles?

> Why are acetals stable to bases and nucleophiles? Could it be due to electronic effects? Lone pairs on the two oxygen atoms create an unfavorable environment for the approaching nucleophiles... more

#### Is it possible to synthesise ethers from carboxylic acids?

Is it possible to synthesise ethers from carboxylic acids, and if so, how? By ether I mean an ether in general, not just specific examples.

03/13/19

#### Relative acidities of alkanes, alkenes, and alkynes?

How does one explain the trend in bond lengths and acidity of the following hydrocarbons?

03/13/19

#### What's the difference between a nucleophile and a base?

Obviously it depends on the context whether you would call a particular species a nucleophile or a base but are the two terms largely synonymous or is there a difference?

02/01/18

#### chemical that would react with ribitol phosphate.

i am a microbiologist, and i have a question from chemistry. i would like to know what are the possible kind of chemicals that would react with ribitol phosphate and result in a colour change or... more
Acid Base Chemistry Ph

01/08/18

#### If I dissolve a Rolaids tablet (550 mg CaCO3 and 110 mg Mg(OH)2) in 25 ml of water and then add 25 ml of 0.1M HCl, what will be the final pH?

Am doing an experiment on antacids and need to know pH of Rolaids tablet in water, followed by pH of mixture after HCl is added.
Acid Base

11/20/17

#### Calculation for buffers

How to calculate amount of sodium acetate and acid acid to produce 500ml 50ppm of fluoride solution

04/07/17

#### How much 1M HCl should I add to 100 mL H2O to lower its pH by 1?

It's for a Biology project- I need to have different pH of solutions, with my base point being water with a pH of 7, and then increments down to a pH of 3. I don't know how much HCl to add for each... more
Acid Base

04/01/17

#### the human body is completely neutral

between 20 and 10000 characterrs.

08/28/16

#### If a patient has a blood volume of 4.7L, how much H+ is in deficit?

I know that is has to do with pH and hydrogen ions, but i do not know what is the correlation between volume and hydrogen ions

08/12/16

#### chemistry about base and acid and buffer

hello, I was wondering if you'd be able to help me with chemistry?tomorrow I have an exam and I don't understand some things. 1. when can you say of a buffer is effective or not?2. so the prof gave... more

A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 66.2 mL of KOH is __________ M. 0.723 1.00 × 10-7 2.81 × 10-13 0.439... more

02/08/16

#### the reactions of amines and it's solubility

How does the solubility in water differ for the nitrogen containing compounds? Suggest reasons for this.What would you expect the solubility in non-aqueous solvents to be? Does your answer to this... more

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