Answer:
The mass of the silver block is 95.52 grams.
Explanation:
Heat lost by silver will be equal to heat gained by the water
Mass of silver=
Specific heat capacity of silver =
Initial temperature of the silver =
Final temperature of a silver = =
Mass of water=
Specific heat capacity of water=
Initial temperature of the water =
Final temperature of water =
On substituting all values:
we get,
The mass of the silver block is 95.52 grams.
Answer:
0,07448M of phosphate buffer
Explanation:
sodium monohydrogenphosphate (Na₂HP) and sodium dihydrogenphosphate (NaH₂P) react with HCl thus:
Na₂HP + HCl ⇄ NaH₂P + NaCl <em>(1)</em>
NaH₂P + HCl ⇄ H₃P + NaCl <em>(2)</em>
The first endpoint is due the reaction (1), When all phosphate buffer is as NaH₂P form, begins the second reaction. That means that the second endpoint is due the total concentration of phosphate that is obtained thus:
0,01862L of HCl×= 1,862x10⁻³moles of HCl ≡ moles of phosphate buffer.
The concentration is:
= <em>0,07448M of phosphate buffer</em>
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I hope it helps!