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!
Answer: Most of the volume of a gas is composed of the large amounts of empty space between the gas particles.
Explanation:
Answer:b
Explanation: the particles will soon dissolve which means that the particles are changing but the volume is staying the same and the concentration is changing
Answer:
c) CH3CH2CH2CH3
Explanation:
Surface tension; The molecules inside the liquid attract the surface molecules and try to draw the them and make the liquid to assume in the shape having the least surface area. The suface tension increase with increase in intermolecular forces of surface liquid.
CH3CH2CH2CH3 is non-polar and have weak intermolecular forces such as London-dispersion forces.
(CH3)2CO, H2O and CH3OH are polar and have strong intermolecular forces such as hydrogen bonding.
C6H6 have high molecular mass, so will have stronger intermolecular forces.
4.2 grams i think i hope this helps