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bogdanovich [222]
3 years ago
15

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions.

it has the unwieldy formula of khc8h4o4. this is often written in shorthand notation as khp. how many grams of khp are needed to exactly neutralize 28.5 ml of a 0.483 m barium hydroxide solution ?
Chemistry
2 answers:
Norma-Jean [14]3 years ago
6 0

2 KHP(aq) + Ba(OH)_{2}(aq) ---> KP_{2}Ba (aq) + 2 H_{2}O (l)\

Moles of Ba(OH)_{2}=0.483 \frac{mol}{L} * 28.5 mL *\frac{1 L}{1000mL}  = 0.0138 mol Ba(OH)_{2}

Mass of KHP = 0.0138 mol Ba(OH)_{2} * \frac{2 mol KHP}{1 mol Ba(OH)_{2}}  * \frac{204.22 g KHP}{1mol KHP}

= 5.64 g KHP

Tamiku [17]3 years ago
6 0

Answer:

5.64g of KHP

Explanation:

2KHC8H4O4 + Ba (OH)2 → Ba (KC8H4O4)2 + 2H2O

Number of moles (n) = concentration × volume

Number of moles (n) = 0.483× 28.5/1000= 0.0138 moles of Ba(OH)2

From the reaction equation:

2 moles of KHP reacted with 1 moles of Ba(OH)2

x moles of KHP will react with 0.0138 moles of Ba(OH)2

x= 2× 0.0138/1 = 0.0276 moles

Molar mass of KHP = 204.22 g/mol

Therefore mass of KHP = 204.22 g/mol × 0.0276 moles= 5.64g of KHP

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Explanation:

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First thing's first, we have to find he limiting reactant. This is done by comparing the number of moles of the reactants.

From the equation of the reaction;

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Back to the question;

2 mol of CH3CHO produces 2 mol of CH3COOH  

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Solving for x;

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(b) how many grams of the excess reactant remain after the reaction is

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Number of moles left =  0.3125 mol - (0.454 mol / 2)

Number of moles left = 0.0855 mol

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