Chemistry, 03.11.2020 03:20 sihamabdalla591

3.47 g of the hydrated "double salt", ammonium iron (II) sulfate hexahydrate, FeSO4(NH4)2SO4*6H2O was dissolved in 200. mL of water. 20.0 mL of the solution had some acid added to it and then it reacted completely with 12.6 mL of KMnO4 solution. Calculate the concentration of the KMnO4 solution given the full REDOX equation below. 5Fe2+ + MnO4- + 8H+ --> 5Fe3+ +Mn2+ + 4H2O

Answers: 3

Show answers

Answers

Answer from: kiki4832

$1.4 * 10^{-4 }M$

The balanced redox reaction equation is shown below:

$5Fe^{2+} + MnO_4^{-} + 8H^{+}$ → $5Fe^{3+} +Mn^{2+} + 4H_2O$

Molar mass of FeSO₄(NH₄)₂SO₄*6H₂O = 392 g/mol

Number of moles $Fe^{2+}$ in FeSO₄(NH₄)₂SO₄*6H₂O

$\text{Number of Moles}= \frac{3.47g}{392g/mol} = 8.85 * 10^{-5} \text{ moles}$

Concentration of $Fe^{2+}$ = $8.85 * 10^{-5} \text{ moles} *\frac{1000}{200} = 4.425 *10^{-4} M$

Let C_A be concentration of $Fe^{2+}$ = $4.425 * 10^{-4} M$

Volume of $4.425 * 10^{-4} M$ ( V_A )= 20.0 ml

Let the concentration of $MnO_4^{-}$ be C_B (the unknown)

Volume of the $MnO_4^{-}$ ( V_B ) = 12.6 ml

Let the number of moles of $Fe^{2+}$ be N_A = 5 moles

Let the number of moles of $MnO_4^{-}$ be N_B = 1 mole

Typically for acid and base reactions, using a titration will help you determine how much acid or base is needed to neutralize the other, and also the concentration and molarity of the solution which is given as"

$\frac{C_AV_A}{C_BV_B} = \frac{N_A}{N_B} \\\\C_AV_AN_B = C_BV_BN_A\\\\C_B= C_AV_AN_B/V_BN_A\\\\C_B= 4.425 * 10^{-4} * 20 * 1/12.6 * 5\\\\C_B = 1.4 * 10^{-4} M$

Learn more:

link

Answer from: btsheygirl

1.4 × 10^-4 M

Explanation:

The balanced redox reaction equation is shown below;

5Fe2+ + MnO4- + 8H+ --> 5Fe3+ +Mn2+ + 4H2O

Molar mass of FeSO4(NH4)2SO4*6H2O = 392 g/mol

Number of moles Fe^2+ in FeSO4(NH4)2SO4*6H2O = 3.47g/392g/mol = 8.85 × 10^-5 moles

Concentration of Fe^2+ = 8.85 × 10^-5 moles × 1000/200 = 4.425 × 10^-4 M

Let CA be concentration of Fe^2+ = 4.425 × 10^-4 M

Volume of Fe^2+ (VA)= 20.0 ml

Let the concentration of MnO4^- be CB (the unknown)

Volume of the MnO4^- (VB) = 12.6 ml

Let the number of moles of Fe^2+ be NA= 5 moles

Let the number of moles of MnO4^- be NB = 1 mole

From;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CB= CAVANB/VBNA

CB= 4.425 × 10^-4 × 20 × 1/12.6 × 5

CB = 1.4 × 10^-4 M

Answer from: Quest

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.

Answer from: Quest

shield volcanos are angry and get mad over the smallest things so much that there heads erupt pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its peaceful thing and knows how to control its emotions.