Tweeted twitter.com/StackChemistry/status/990310018657513472
3 deleted 277 characters in body
source | link

I am preparing for my Chemistry exam next week. I came across this question and I am unsure of the answer. Any insight would be greatly appreciated.I'm not sure what approach to take in order to answer the question.

In an experiment, $5$ $\text{cm}^3$$\pu{5 cm^3}$ of $1$ $\text{mol/dm}^3$$\pu{1 mol/dm^3}$ sodium hydroxide are gradually added to $10$ $\text{cm}^3$$\pu{10 cm^3}$ of $1$ $\text{mol/dm}^3$$\pu{1 mol/dm^3}$ hydrochloric acid containing methyl orange. What changes changes occur in the mixture?

  • A) The concentration of H+ ions increase (decreases)
  • B) The methyl orange changes colour
  • C) More water molecules are formed (water is formed, but use of the word 'more'??)
  • D) A precipitate is formed (no ppt formed, NaCl is soluble)
  1. The concentration of $\ce{H+}$ ions increase (decreases)
  2. The methyl orange changes colour
  3. More water molecules are formed (water is formed, but use of the word 'more'??)
  4. A precipitate is formed (no ppt formed, $\ce{NaCl}$ is soluble)

I thought the answer would be B(2). However when thinking about the question the methyl orange would be red in the acid and given the proportions of the reactants and the $1:1$1:1 mole ratio, the HCl$\ce{HCl}$ would be in excess, so would it still change colour?

Thanks in advanced for any reply.

I am preparing for my Chemistry exam next week. I came across this question and I am unsure of the answer. Any insight would be greatly appreciated.I'm not sure what approach to take in order to answer the question.

In an experiment, $5$ $\text{cm}^3$ of $1$ $\text{mol/dm}^3$ sodium hydroxide are gradually added to $10$ $\text{cm}^3$ of $1$ $\text{mol/dm}^3$ hydrochloric acid containing methyl orange. What changes occur in the mixture?

  • A) The concentration of H+ ions increase (decreases)
  • B) The methyl orange changes colour
  • C) More water molecules are formed (water is formed, but use of the word 'more'??)
  • D) A precipitate is formed (no ppt formed, NaCl is soluble)

I thought the answer would be B. However when thinking about the question the methyl orange would be red in the acid and given the proportions of the reactants and the $1:1$ mole ratio, the HCl would be in excess, so would it still change colour?

Thanks in advanced for any reply.

In an experiment, $\pu{5 cm^3}$ of $\pu{1 mol/dm^3}$ sodium hydroxide are gradually added to $\pu{10 cm^3}$ of $\pu{1 mol/dm^3}$ hydrochloric acid containing methyl orange. What changes occur in the mixture?

  1. The concentration of $\ce{H+}$ ions increase (decreases)
  2. The methyl orange changes colour
  3. More water molecules are formed (water is formed, but use of the word 'more'??)
  4. A precipitate is formed (no ppt formed, $\ce{NaCl}$ is soluble)

I thought the answer would be (2). However when thinking about the question the methyl orange would be red in the acid and given the proportions of the reactants and the 1:1 mole ratio, the $\ce{HCl}$ would be in excess, so would it still change colour?

2 Formatting
source | link

I am preparing for my Chemistry exam next week. I came across this question and I am unsure of the answer. Any insight would be greatly appreciated.I'm not sure what approach to take in order to answer the question.

In an experiment, 5 cm3 of 1.0 mol/dm3 sodium hydroxide are gradually added to 10 cm3 of 1.0 mol/dm3 hydrochloric acid containing methyl orange. What changes occur in the mixture?

  • A)The concentration of H+ ions increase [x- decrease]
  • B) The methyl orange changes colour
  • C) More water molecules are formed- [x water is formed (but use of the word 'more'??)]
  • D) A precipitate is formed [x- no ppt formed, NaCl is soluble]

In an experiment, $5$ $\text{cm}^3$ of $1$ $\text{mol/dm}^3$ sodium hydroxide are gradually added to $10$ $\text{cm}^3$ of $1$ $\text{mol/dm}^3$ hydrochloric acid containing methyl orange. What changes occur in the mixture?

  • A) The concentration of H+ ions increase (decreases)
  • B) The methyl orange changes colour
  • C) More water molecules are formed (water is formed, but use of the word 'more'??)
  • D) A precipitate is formed (no ppt formed, NaCl is soluble)

I thought the answer would be B. However when thinking about the question the methyl orange would be red in the acid and given the proportions of the reactants and the 1:1$1:1$ mole ratio, the HCl would be in excess, so would it still change colour?

Thanks in advanced for any reply.

I am preparing for my Chemistry exam next week. I came across this question and I am unsure of the answer. Any insight would be greatly appreciated.I'm not sure what approach to take in order to answer the question.

In an experiment, 5 cm3 of 1.0 mol/dm3 sodium hydroxide are gradually added to 10 cm3 of 1.0 mol/dm3 hydrochloric acid containing methyl orange. What changes occur in the mixture?

  • A)The concentration of H+ ions increase [x- decrease]
  • B) The methyl orange changes colour
  • C) More water molecules are formed- [x water is formed (but use of the word 'more'??)]
  • D) A precipitate is formed [x- no ppt formed, NaCl is soluble]

I thought the answer would be B. However when thinking about the question the methyl orange would be red in the acid and given the proportions of the reactants and the 1:1 mole ratio, the HCl would be in excess, so would it still change colour?

Thanks in advanced for any reply.

I am preparing for my Chemistry exam next week. I came across this question and I am unsure of the answer. Any insight would be greatly appreciated.I'm not sure what approach to take in order to answer the question.

In an experiment, $5$ $\text{cm}^3$ of $1$ $\text{mol/dm}^3$ sodium hydroxide are gradually added to $10$ $\text{cm}^3$ of $1$ $\text{mol/dm}^3$ hydrochloric acid containing methyl orange. What changes occur in the mixture?

  • A) The concentration of H+ ions increase (decreases)
  • B) The methyl orange changes colour
  • C) More water molecules are formed (water is formed, but use of the word 'more'??)
  • D) A precipitate is formed (no ppt formed, NaCl is soluble)

I thought the answer would be B. However when thinking about the question the methyl orange would be red in the acid and given the proportions of the reactants and the $1:1$ mole ratio, the HCl would be in excess, so would it still change colour?

Thanks in advanced for any reply.

1
source | link

What changes occur when adding differing amounts of acids & bases?

I am preparing for my Chemistry exam next week. I came across this question and I am unsure of the answer. Any insight would be greatly appreciated.I'm not sure what approach to take in order to answer the question.

In an experiment, 5 cm3 of 1.0 mol/dm3 sodium hydroxide are gradually added to 10 cm3 of 1.0 mol/dm3 hydrochloric acid containing methyl orange. What changes occur in the mixture?

  • A)The concentration of H+ ions increase [x- decrease]
  • B) The methyl orange changes colour
  • C) More water molecules are formed- [x water is formed (but use of the word 'more'??)]
  • D) A precipitate is formed [x- no ppt formed, NaCl is soluble]

I thought the answer would be B. However when thinking about the question the methyl orange would be red in the acid and given the proportions of the reactants and the 1:1 mole ratio, the HCl would be in excess, so would it still change colour?

Thanks in advanced for any reply.