Question

Na₂SO₃?7H₂OÊÇʳƷ¹¤ÒµÖг£ÓõÄƯ°×¼Á¡¢¿¹Ñõ»¯¼ÁºÍ·À¸¯¼Á£®Na₂SO₃ÔÚ30¡æʱµÄÈܽâ¶ÈΪ35.5g/100gH₂O£®
1£©¼ÆËã30¡æʱNa₂SO₃±¥ºÍÈÜÒºÖÐNa₂SO₃µÄÖÊÁ¿·ÖÊý¦Ø£®£¨±£Áô2λСÊý£©
2£©¼ÆËã30¡æʱ271g Na₂SO₃±¥ºÍÈÜÒºÖÐË®µÄÖÊÁ¿£®
3£©½«30¡æµÄNa₂SO₃±¥ºÍÈÜÒº271gÀäÈ´µ½10¡æ£¬Îö³öNa₂SO₃?7H₂O¾§Ìå79.5g£®¼ÆËã10¡æʱNa₂SO₃ÔÚË®ÖеÄÈܽâ¶È£®

Answer 1

1£©¸ù¾ÝNa₂SO₃µÄÈܽâ¶È£¬Æä±¥ºÍÈÜÒºÖÐÈÜÖÊΪ35.5g£¬ÈܼÁΪ100g£¬ÈÜÒº×ÜÖÊÁ¿=100+35.5=135.5g£¬
Ôò¦Ø£¨Na₂SO₃£©=

35.5g

135.5g

¡Ö0.26£»
2£©271g±¥ºÍÈÜÒºÖУ¬¼ÙÉèÆ京ÓеÄÈܼÁΪx£¬
Na₂SO₃ÔÚ30¡æʱµÄÈܽâ¶ÈΪ35.5g/100gH₂O£¬
Ôò

100g

135.5g

=

x

271g

£¬
½âÖ®µÃ£ºx=200£¨g£©£»
3£©ÀäÈ´ÈÜÒººó£¬Îö³ö¾§Ìå79.5g£¬¸ù¾ÝÆ侧ÌåNa₂SO₃?7H₂OµÄ×é³É£¬ÆäÖк¬ÓÐË®ºÍÑÇÁòËáÄÆΪ£º
m£¨Na₂SO₃£©=79.5g¡Á

126

126+126

=39.75g
m£¨H₂O£©=79.5g-39.75g=39.75g
10¡æʱNa₂SO₃µÄÖÊÁ¿Îª271-200-39.75=31.25g
10¡æʱH₂OµÄÖÊÁ¿Îª200-39.75=160.25g
¼ÙÉè10¡æʱNa₂SO₃µÄÈܽâ¶ÈΪy

100g

y

=

160.25g

31.25g

£¬
½âµÃy=19.5g£»
´ð£º1£©30¡æʱNa₂SO₃±¥ºÍÈÜÒºÖÐNa₂SO₃µÄÖÊÁ¿·ÖÊýΪ0.26£»
2£©30¡æʱ271g Na₂SO₃±¥ºÍÈÜÒºÖÐË®µÄÖÊÁ¿Îª200g£»
3£©10¡æʱNa₂SO₃ÔÚË®ÖеÄÈܽâ¶ÈΪ19.5g£®